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The most obvious answer here is to simply take it's square root, and see if the answer is an integer. If it is, then your number is a perfect square.

If you don't know it's square root offhand and don't have a calculator handy, you could do it by adding up a series of odd numbers, and seeing if they reach a sum that is equal to the original number. If they do, then you have a perfect square. Otherwise, you don't.

For example, is 36 a perfect square? Let's find out:

0 + 1 = 1

1 + 3 = 4

4 + 5 = 9

9 + 7 = 16

16 + 9 = 25

25 + 11 = 36

Since we hit 36 with our addition, we know that 36 is indeed a perfect square.

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Q: How can you tell if a decimal is a perfect square?
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