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75 is a composite number because it has factors other than 1 and itself. It is not a Prime number.
The 6 factors of 75 are 1, 3, 5, 15, 25 and 75.

The factor pairs of 75 are 1 x 75, 3 x 25 and 5 x 15.

The proper factors of 75 are 1, 3, 5, 15, and 25 or if the definition you are using excludes 1, they are 3, 5, 15, and 25.

The prime factors of 75 are 3 and 5.
The 2 distinct prime factors (listing each prime factor only once) of 75 are also 3 and 5.

The prime factorization of 75 is 3 x 5 x 5, or if you are using exponents, 3 x 52.

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 75?
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