16 can have only one square and that is 256.
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They are: 4*4 = 16
52 - 32 = 16.
25 - 9 = 16
They are: 49+16 = 65
25. Square numbers are numbers that result from integers being raised to the power of 2. 1^2 = 1. 1 is the first square number. 2^2 = 4. 4 is the second. 3^2 = 9. 4^2 =16. 5^2 = 25.