They are square numbers.
square numbers
Yes.
Yes, the factors of all odd numbers are odd numbers.
Square numbers have odd numbers of factors.
Square numbers have odd numbers of factors.
Both odd and even numbers may have odd numbers as factors.
50
Perfect squares have an odd number of factors.
Square numbers have an odd number of factors.
Yes. Square numbers have an odd number of factors. 49 has three factors.
4, 9, 16 and 25 are square numbers.