The product of a and 45 is a complete square, the minimum value of a?

The product of a and 45 is a complete square
Because 45 = 5 * 3 * 3
If it's a perfect square, just multiply it by 5
That is, the square of 5 * 3 * 3 * 5 = 45 * 5 = 225 = 15
A: the minimum value of a is 5

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