Question

Find the greatest 4 digit no which is a perfect square ? findsquare root of resulting no

Answer 1

Greatest number of four digits =9999=9999Let us find the square root of 99999999This shows that 992992 is less than 99999999 by 198198So, the least number to be subtracted is 198198Hence , the required number is (9999−198)(9999−198)=9801