Because 5 times 5 = 25 and 3 times 3 = 9
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The first five perfect squares are: 1, 4, 9, 16, 25
The only perfect squares from 1 to 31 are 1, 4, 9, 16, and 25.All of the other 26 are NOT perfect squares.2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,20,21,22,23,24,26,27.28,29,30,31
9, 16 and 25 are all perfect squares.
They are: 9, 16 and 25
Only 25 which is, 52 = 32 + 42 (25 = 9 + 16)