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