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A square number is an integer which is the square of some smaller integer. For example, 144 is square because 144 = 12*12 = 12^2

400 is a square number because 400 = 20^2. Anything bigger than 20, when multiplied by itself, will make a square greater than 400.

How about 21?

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Dakota Queary

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Q: What is a square number greater than 400?
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