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Composite number
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
Prime numbers
.
* The integers must be greater than one.
Other number topics
Introduction to numbers
The number line
Scalar numbers
What are scalars?
Real numbers
Integers
Natural Numbers
Positive numbers
Negative numbers
The uses of negative numbers
Scientific notation (normal form)
Complex numbers
Imaginary numbers
Counting numbers
Counting numbers (whole numbers)
Cardinal numbers
Cardinality
Ordinal numbers
Numbers that have factors
Prime numbers
Composite (opposite of prime) numbers
Rational numbers
Irrational numbers
Special values
i
j
pi
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