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

The 4 factors of 155 are 1, 5, 31, and 155.

The factor pairs of 155 are 1 x 155 and 5 x 31.

The proper factors of 155 are 1, 5, and 31 or,

if the definition you are using excludes 1, they are 5 and 31.

The prime factors of 155 are 5 and 31.

The 2 distinct prime factors (listing each prime factor only once) of 155 are 5 and 31.

The prime factorization of 155 is 5 x 31.

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 155?
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