Gosh, another high number! (I've answered a question that's similar to this.) Anyway, I'm not sure about this number, so please pardon me if Ik'm wrong, but based on my prior knowledge and half an hour of solving, 8347 might be a Prime number.
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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