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A number is a "square number" if it corresponds to a square arrangement of dots in a regular grid pattern. The first few square numbers are...

1:

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4: (2 x 2 grid)

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9: (3 x 3 grid)

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. . .
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and so on.

36 is a square number because that's how many dots are in a 6 x 6 grid.

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15y ago

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