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9
8 is a multiple and is not a perfect square.
A number that is divisible by 6 but not by 3 must be a multiple of 6 that is not a multiple of 3. Since 6 is a multiple of 3 (6 = 2 * 3), any multiple of 6 will also be a multiple of 3. Therefore, there is no number that is divisible by 6 but not by 3.
25 it is the square of 5 (5x5=25)
you add up the digits, and if the sum is a multiple of 3, then the number is divisible by 3!