Prime numbers
factor
A factor
a factor.
They are called relative prime numbers.
Like 21? Prime numbers.
Prime numbers have those factors.
Those are called prime numbers.
Those numbers are called factors. A pair of those is called a factor pair.
One of the numbers is a factor of the other.
To distinguish them from prime numbers. Composite means "made up of various parts or elements." Prime numbers have one and only one factor pair. Composite numbers have a various number of factor pairs, but always more than one.
A number with more than one factor is normal, since all numbers except 0 and 1 have more than one factor. A number with more than two factors is composite.
When one of the numbers is a factor of the other.