Because they are the products of 5 x 5 and 6 x 6 respectively. A square number is the product of two of the same integers.
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25 and 36 are square numbers since 52 =25 and 62=36. 48 is not one.
25 +3625
1, 4, 9, 16, 25, 36
The perfect squares in the range are 25, 36 and 49.
1 4 9 16 25 and 36