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1155 is a composite number because it has factors other than 1 and itself. It is not a Prime number.
The 16 factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, and 1155.
The proper factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, and 385 or,
if the definition you are using excludes 1, they are 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, and 385.
The prime factors of 1155 are 3, 5, 7, and 11.
The 4 distinct prime factors (listing each prime factor only once) of 1155 are 3, 5, 7, and 11.
The prime factorization of 1155 is 3 x 5 x 7 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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Is 1155 prime composite or neither?
1155 is obviously a multiple of 5 and a multiple of 11, so it is a composite number.
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the answer is ........ factors are 1,2,3,6,9,18 ; 1x18,2x9,3x6 prime factors are 2x3x3
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