Definition:Composite Number

Definition
A composite number $c$ is a positive integer that has more than two positive divisors.

Extension to All Integers
The definition of a composite number can be extended to all of the integers. A non-negative integer $n$ is composite iff $n$ has more than two positive divisors. A negative integer $n$ is composite iff $\left|{n}\right|$ is composite.

Comment
$1$ is a special case - it is neither prime nor composite. All of the other positive integers are either prime or composite.