In the number sentence 3 x 6, 3 and 6 are factors of 18. 3 is prime. The prime factorization of 18 is 2 x 3 x 3.
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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.
A factor can or cannot be a prime number Ex: 2 is the factor of all other even numbers its a prime number but 9 is a factor of 18 and its not a prime number A prime is a factor but a factor being a prime number varies
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
12 is a composite number, not a prime factor.