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Find the greatest 7 digit number which is a perfect square?

Find the greatest 7 digit number which is a perfect square?

the greatest seven digit no. is 9999999 < 1,00,00,000

and if we take smallest 8 digit no. it is 1,00,00,000

we take the square root of = 3162.28 which is not a whole number

and (3162 )² < (3162.28)²

 so 9998244 < (3162.28)²

so, 9998244 is the greatest 7 digit perfect square