squares and squareroot by sun

The digit at unit’s place of square of 289

The sum of first five odd numbers

The smallest 4-digit perfect square is

There are..................... perfect squares between 1 and 100.

Find the least number that must be multiplied to147 to make it a perfect square.

Find the square root of the following numbers by division method : 625, 6561

Write a Pythagorean triplet whose one number is 20.

Find the square root of 2025 using prime factorization method.

Find the least square number which is divisible by each of the numbers 4, 8 and 12.

Find the square root of 225 using successive subtraction of odd numbers starting from 1.