A square number, because its square root is paired with itself.
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.
all perfect square numbers
Square numbers have an odd number of factors.
Perfect squares are numbers with 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.
A perfect square has an odd number of factors.
Both odd and even numbers may have odd numbers as factors.
A square number.
A perfect square.
A perfect square.
A square number.
Square numbers have odd numbers of factors. Examples: 4, 9, 16
Square numbers have an odd number of factors.
A perfect square
Square numbers
Square numbers.