Python Tkinter Calculator

I've just started to learn to code and I decided that my first project would be a Calculator with a GUI. I have created the GUI with the buttons and all the main operations work (+, - etc.) and I tried to add square, square root, and decimals, but ran into some problems. My square works just fine but my square root keeps saying that there is an error because the "Float object is not callable" , I tried to add "int(float()" but it didn't work. For my decimal point, it says, "TypeError: insert() missing 1 required positional argument: 'string''. Can someone please show me where I have gone wrong, thank you. (Below is my code if you would like to see or run it.)

from tkinter import *

main = Tk()
main.title("Calculator App")

e = entry = Entry(main, width=60, borderwidth=5)
entry.grid(row=0, column=0, columnspan=6, padx=10, pady=10)



# Functions for my operations


def button_click(number):
    current = e.get()
    e.delete(0, END)
    e.insert(0, str(current) + str(number))

def buttonclear():
    e.delete(0, END)

def buttonadd():
    number_one = e.get()
    global number1
    global calculator
    calculator = "addition"
    number1 = int(number_one)
    e.delete(0, END)

def buttonequal():
    numbertwo = e.get()
    e.delete(0, END)


    if calculator == "addition":
        e.insert(0, number1 + int(numbertwo))
    elif calculator == "subtraction":
        e.insert(0, number1 - int(numbertwo))
    elif calculator == "division":
        e.insert(0, number1 / int(numbertwo))
    elif calculator == "multiplication":
        e.insert(0, number1 * int(numbertwo))
    elif calculator  == "square":
        e.insert(0, number1**2)
    elif calculator == "square root":
        sqrt = number1 ** 0.5
        e.insert(0, sqrt(number1))
    elif calculator == "decimal":
        e.insert(float(0))


def buttonminus():
    number_one = e.get()
    global number1
    global calculator
    calculator = "subtraction"
    number1 = int(number_one)
    e.delete(0, END)

def buttonmultiply():
    number_one = e.get()
    global number1
    global calculator
    calculator = "multiplication"
    number1 = int(number_one)
    e.delete(0, END)

def buttondivide():
    number_one = e.get()
    global number1
    global calculator
    calculator = "division"
    number1 = int(number_one)
    e.delete(0, END)

def buttonsquare():
    number_one = e.get()
    global number1
    global calculator
    calculator = "square"
    number1 = int(number_one)
    e.delete(0, END)

def buttonsquareroot():
    number_one = e.get()
    global number1
    global calculator
    calculator = "square root"
    number1 = int(number_one)
    e.delete(0, END)

def buttondot():
    number_one = e.get()
    global number1
    global calculator
    calculator = "decimal"
    number1 = float(number_one)
    e.delete(0, END)



# These are my buttons, 0-9 then the operations

label_1 = Button(text="1",  padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(1))
label_2 = Button(text="2",  padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(2))
label_3 = Button(text="3" ,  padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(3))
label_4 = Button(text="4", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(4))
label_5 = Button(text="5", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(5))
label_6 = Button(text="6", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(6))
label_7 = Button(text="7", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(7))
label_8 = Button(text="8", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(8))
label_9 = Button(text="9", padx=40, pady=20, bg="Powder Blue", command=lambda: button_click(9))
label_0 = Button(text="0", padx=39.5, pady=20, bg="Powder Blue", command=lambda: button_click(0))

label_equal = Button(text="=", padx=40, pady=20, bg="Powder Blue", width=9, command=lambda: buttonequal())
label_plus = Button(text="+", padx=40, pady=20, width=9, bg="Powder Blue", command=lambda: buttonadd())
label_minus = Button(text="-", padx=40, pady=20, width=9, bg="Powder Blue", command=lambda: buttonminus())
label_multiply = Button(text="x", padx=40, pady=20, width=9, bg="Powder Blue", command=lambda: buttonmultiply())
label_divide = Button(text="/", padx=40, pady=20, width=9, bg="Powder Blue", command=lambda:buttondivide())
label_clear = Button(text="C", font=15, padx=35.4, pady=17, bg="Powder Blue", command=lambda: buttonclear())
label_square = Button(text="Sq", padx=36, pady=20, bg="Powder Blue", command=lambda: buttonsquare())
label_squareroot = Button(text="Sqrt", padx=32, pady=20, bg="Powder Blue", command=lambda: buttonsquareroot())
label_dot = Button(text=".", padx=41, pady=52, bg="Powder Blue", command=lambda: buttondot())




# Organising them into correct order for the GUI

label_1.grid(row=3,column=0)
label_2.grid(row=3,column=1)
label_3.grid(row=3, column=2)
label_divide.grid(row=1, column=3)
label_4.grid(row=2, column=0)
label_5.grid(row=2, column=1)
label_6.grid(row=2, column=2)
label_multiply.grid(row=2, column=3)
label_7.grid(row=1, column=0)
label_8.grid(row=1, column=1)
label_9.grid(row=1, column=2)
label_minus.grid(row=3, column=3)
label_0.grid(row=4, column=1)
label_equal.grid(row=5, column=3)
label_plus.grid(row=4, column=3)
label_clear.grid(row=4, column=0)
label_square.grid(row=5, column=0)
label_squareroot.grid(row=5, column=1)
label_dot.grid(row=4, column=2, rowspan=2)






main.mainloop()