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Square numbers

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The square numbers, or perfect squares, or just squares, are integers having an integer for a square root. For example, 144 is a square number, since \sqrt{144} = 12. (But 12 is not a square number, since \sqrt{12} = 2 \sqrt{3} \approx 3.464101615). See A000290.

4-sided polygonal numbers.

2-dimensional regular orthotopic numbers.

2-dimensional orthoplicial polytopic numbers.

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