The square numbers between 1 and 20 are 1,4,9 and 16.
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All whole numbers between 1 and 400 (=20 square).
There are (not counting 1) three square numbers between 1 and 20.
4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
1000
There are 16 square numbers between 1 and 300: 2 to 17 inclusive. There is no square root of these numbers: only of their sum or product or average or some other operation.