Question

find the greatest 4 digit number which is a perfect square ​

Answer 1

the square of any 3 digit is either a 5 digit or a 6 digit number.Eg:100×100=10000(5 digit)999×999=998001(6 digit)Hence the largest 4 digit perfect square shall be the square of the largest 2 digit number. i.e. 99.Hence ,99×99=9801.Therefore the answer is 9801.

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