All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.
All but the square numbers - 53 of them.
Square numbers have an odd number of factors.
All even numbers have at least one even prime factor.
At least one of the factors of an even number must be even, because the product of odd factors is always odd.
No, only square numbers have an odd number of factors.
Factors come in pairs. It is only in the case of a square number that the two middle factors are equal and so are counted only once.
All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.
There are square numbers (numbers which are a square of an integer), such as 4. It's factors, listed are 1, 2, and 4. All square numbers have an odd number of factors. Then there's 1, which has only 1 factor: 1. All other numbers have an even number of factors. Prime numbers will have only 2 factors (2 is even).
The factors of all numbers can be written in pairs. With square numbers, one of those pairs is the same number twice. When listed singly, square numbers have an odd number of factors. All others are even.
No. Perfect square numbers have an odd number of factors.
Not necessarily. Square numbers don't.
Even powers of prime numbers. Square numbers have an odd number of factors.
No, square numbers have an odd number of factors.
Square numbers have an odd number of factors, all others have an even number. In this context, primes can either be considered as having 0 factors (an even number) or 2 factors - 1 and itself, again, an even number.
An even power. Square numbers have an odd number of factors.
Incorrect. Square numbers are composite and have an odd number of factors.