A composite number (or simply composite) is a natural number, that can be gotten by multiplying prime numbers. For example, the number 9 can be gotten by multiplying 3 with 3. Take the number 12. You get it by multiplying 3 with 2 with 2.

All natural numbers (greater than 1) can be put in one of the two classes below:

• The number is prime.
• The number is not prime. It can be gotten by multiplying a certain number of primes. The same prime might be used several times, as in the example above. This is known as Fundamental theorem of arithmetic.

See also

• Perfect number

Mathematics

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