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

The only factors for 55 are 1, 5, 11, 55

The factor pairs of 55 are 1 x 55 and 5 x 11.

The proper factors of 55 are 1, 5, and 11 or,

if the definition you are using excludes 1, they are 5 and 11.

The prime factors of 55 are 5 and 11.

The 2 distinct prime factors (listing each prime factor only once) of 55 are also 5 and 11.

The prime factorization of 55 is 5 x 11.

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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13y ago
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Q: What are the factors and prime factors of 55?
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