Math Open Reference
Definition: A composite number is an integer than is composed of integer factors. It is the opposite of a prime number.
A composite number is one that can be formed by multiplying some integers* together. For example 18 is composite because
18 = 2 × 3 × 3
It follows that composite numbers are never prime numbers. For more see
* The integers must be greater than one.
Other number topics
Introduction to numbers
The number line
What are scalars?
The uses of negative numbers
Scientific notation (normal form)
Counting numbers (whole numbers)
Numbers that have factors
Composite (opposite of prime) numbers
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