isqrt function of math module in Python

Function Name:

isqrt

isqrt(n)

n – A nonnegative integer for which the integer square root to be found.

Integer square root of the given nonnegative integer.

The function isqrt(), of the Python math module returns the integer part of the square root of the input. Compare this with the output of the sqrt() function.
The input is a nonnegative integer. The integer part returned is the floor of the square root of the input.
The isqrt() function internally uses the Newton"s iteration method.

# Example Python program that computes the integer square root of a nonnegative integer

import math

# Input

n = 766796512

# Find the integer square root

intSquareRoot = math.isqrt(n);

print("Integer square root of a given number:");

print(intSquareRoot);

Integer square root of a given number:

27691

# Example Python program that raises a ValueError when
# math.isrt() is passed a negative integer
import math

# Get the integer square root of 10
num = -225
r = math.isqrt(num)
print("Integer square root of %d is %d"%(num, r))

Traceback (most recent call last):

File "/Valli/PythonProgs/isroot.py", line 7, in <module>

r = math.isqrt(num)

ValueError: isqrt() argument must be nonnegative