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You can tell whether a number is a square number by looking at the last digit. A perfect square number ends with either 1, 4, 5, 6, 9 or 00.

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Q: How can I tell whether a number is a square number?
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If the whole number is a perfect square, its square root is rational. If not, it's not.


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What is proof of value of square root?

If I tell you that the square root of 2 (for example) is such-and-such, you can verify this by multiplying the number by itself, and seeing whether the result is close to 2.


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