Composite number 15 prime factorization, expressed as a product of prime factors (ordered from the least to the largest).

15 is not prime, is a composite number.
15 = 3 × 5;

:: A composite number is a positive integer that has at least one factor (divisor) other than 1 and itself. All the factors (divisors) of 15 :: Positive integers that are only dividing by themselves and 1 are called prime numbers.

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see more: Coprime numbers (relatively prime)


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