Any number and its inverse example 4 x 1/4=1 2x 1/2=1
An even number
You need two numbers to have a product.
They are the products of two distinct prime numbers. Along with one and the numbers themselves, they all total four factors.
When one of the numbers is a factor of the other.
Two factors are multiplied to make a product.
Products of prime numbers are composite numbers.
They are the composite numbers, products of primes and their multiples. All even numbers are composite, except the number two (2) which is prime.
The GCF of two numbers is one of the two numbers when one of the numbers is a factor of the other because a number can't have a factor higher than itself.
When one of the numbers is a factor of the other.
One of the numbers is a factor of the other.
At least one of the two numbers has to be even, but both can be even.
The products of non-prime numbers have more than two factors.