The number we get after multiplying an integer (not a fraction) by itself. Example: 4 ? 4 = 16, so 16 is a square number. Here are the first few square numbers: 0 (=0?0) 1 (=1?1) 4 (=2?2) 9 (=3?3) 16 (=4?4) 25 (=5?5) ?
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