Find the greatest 4 digit number which is a perfect square

The smallest 4-digit number is 1000.

The greatest 4-digit number is 9999.

We know that,

The square of 100 is 10000 or 1 more noteworthy than the biggest 4-digit number.

So, the closest square root of the largest perfect square is 99. So. The square of 99 is 9801

Hence, The greatest 4-digit number is 9999, and it is the closest square of 99.

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