Question

search different way to Calculate square root of large numbers​

Answer 1

Separate your number's digits into pairs.

Find the largest integer n whose square is lesser than or equal to the leftmost number (or pair).

Subtract the number you just calculated from the leftmost pair.

Drop down the next pair.

Answer 2

Answer:

if there unit digit are 2, 3,5,7,8 so they have not perfect square