12 = 1
22 = 4
32 = 9
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The square numbers between 1 and 20 are 1,4,9 and 16.
4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
All whole numbers between 1 and 400 (=20 square).
1000
There are (not counting 1) three square numbers between 1 and 20.