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15 is a composite number because it has factors other than 1 and itself. It is not a Prime number.

The 4 factors of 15 are 1, 3, 5, and 15.

The factor pairs of 15 are 1 x 15 and 3 x 5.

The proper factors of 15 are 1, 3, and 5 or,

if the definition you are using excludes 1, they are 3 and 5.

The prime factors of 15 are 3 and 5.

The 2 distinct prime factors (listing each prime factor only once) of 15 are also 3 and 5.

The prime factorization of 15 is 3 x 5.

NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.)

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Q: What are the factors and prime factors of 15?
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