279 is a composite number. Its positive integer factors are:
1, 3, 9, 31, 93, 279
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To find the prime factorization of a number start with any factor pair and keep factoring the composite numbers until all the factors are prime. 279 3 x 91 3 x 7 x 13 = 279
4, composite. 67, prime.
Prime
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.
5 prime, 25 composite.