Composite
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138 is not prime. 138 = 2 * 3 * 23
4, composite. 67, prime.
Prime
The factors of 138 are 1, 2, 3, 6, 23, 46, 69, and 138.
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.