723 is composite. Its positive integer factors are:
1, 3, 241, 723
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No, 723 is not a prime number as it is divisible by 3.
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.