# Which of the following numbers is not a perfect square?A. 3600B. 6400C. 81000D. 2500Hint. The number 81000 ends in an odd number of zeros.

We know that,

As per the properties of square,

All the numbers that end with odd numbers of zeroes are not a perfect square

Hence,

Considering the property, we get

The number 81000 is not a perfect square

As the number of zeroes of this number is 3.

Therefore,

Option (C) is the correct option.

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