A perfect square is the square of an integer. Of the integers from 2 through 99, how many have at least one perfect square factor > 1?

Six numbers have perfect square factors

Step-by-step explanation:

The numbers with perfect square factors are those numbers that have perfect squares as one of the numbers that can divide them.

They include:

4 = 2 * 2

16 = 4 * 4

36 = 6 * 6

49 = 7 * 7

64 = 8 * 8

81 = 9 * 9

These numbers above have perfect square factors because they are formed from integers that multiply themselves.