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A composite number is a positive integer that has divisors other than 1 and the number itself. A composite number can be expressed as a product of two smaller positive integers.

Every positive integer is classified into three groups: prime numbers, composite numbers, and the unit, which is 1.

For example, 13 is a composite number because 13 can be divided evenly by 1, 3, 5 and 13 with no remainder.

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