A square number will have one factor pair that consists of the same number (the square root). In the list of factors, that number will be written once.
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All square numbers have an odd number of factors.
Square numbers have an odd number of factors.
Square numbers have an odd number of factors, but beyond that, any odd number can be a factor.
Square numbers have an odd number of factors. There are no square numbers in that range.
A perfect square has an odd number of factors. Factors of numbers always come in pairs -- except for perfect squares. Since the square root of a perfect square is listed only once on the list of factors, it results in a list with an odd number of factors.