No, it is composite. Enough proof of this is that you can divide it by 3, and get 113.
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It is composite, it is not prime. It is divisible by 3.
339 is a composite number because it has more than 2 factors
The factors of 339 are: 1 3 113 339.The prime factors are: 3, 113
3 does, 339 / 3 = 113.
3 goes into 339 113 times. (3 x 113 = 339.)