## Thinking Mathematically (6th Edition)

A prime number is a number whose only factors are $1$ and itself. On the other hand, a composite number is a number that has factors other than $1$ and itself.
A prime number is a number whose only factors are $1$ and itself. Example: $5$ is a prime number since the only factors of $5$ are $5$ and $1$. A composite number is a number that has factors other than $1$ and itself. Example: $10$ is a composite number since it can be factored as: $10=5(2)$