549 is composite, because it is divisible by 1, 3, 9, 61, 183 and 549. A Prime number may be divisible only by 1 and itself.
The sum of the digits in 549 equals 18. which is divisible by 3. That means 549 is divisible by 3 in addition to 1 and itself.
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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.
Composite