5 and 7
Suppose you have a number n which is not a square. Suppose now that a is a factor of n ie there is some integer b, such that a*b = n. Now since n is not a square, b is not the same as a. Thus for every factor a, there is another factor b ie the factors come in pairs. Therefore, there are an even number of factors.
All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.
All numbers have themselves as factors.
All numbers can be factors.
All numbers have factors. Some factors are prime numbers. A prime factor is a factor that is a prime number. A common prime factor is a prime factor that appears on the list of factors of two or more given numbers.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. If the factor is a prime number, it is a common prime factor. 3 is a prime number. 3 is a factor of 9. 3 is a factor of 12. 3 is a common prime factor of 9 and 12.
All nonzero numbers have factors. Some factors are odd numbers. 3 is an odd factor of 12.
All numbers have factors. Some numbers are larger than others. The largest number in a set of factors will be the greatest factor.
In mathematics, all nonzero numbers have factors. Some factors are even numbers, some are odd. An even factor is a factor that is an even number.
All numbers have factors. Some factors are prime numbers, some are not.
The factors of a number are the numbers that can be multiplied together to get the number. 2 x 4 = 8 Two and four are factors of eight.
Factor rainbows display the prime factors of a given number. Some numbers, Like 27, have an odd number of prime factors. Some numbers, like 81, have an even number of prime factors.