it is composite. Note that the sum of the digits is 3+2+1=6 and since this is a multiple of 3, we know that 3 is a factor of 321. in fact, 321 divided by 3 is 107
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It is a composite number.
321 = 3*107.
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.