Problems Based on Finding the Perfect Squares

Problems based on finding the no of arrangement of letters of the given word

Is 90 a perfect square?

1000 is a perfect square.

Find the least number which must be added to 6203 to abtain a perfect square. Find this perfect square and its square root.

Find the least number which must be added to 8400 to obtain a perfect square. Find this perfect square and its square root.

Find the least number which must be subtracted from 7581 to obtain a perfect square. Find this perfect square and its square root.

Find the least number that must be added to 1500 so as to get a perfect square. Also find the square root of the perfect square

Find the least number that must be subtracted from 5607 so as to get a perfect square.Also find the square root of the perfect square.find the greatest 4 digit number which is a perfect square.