Nope. The only divisors of 3 are 1, and itself. It's a prime.
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Composite, 2223= 3*3*13*19
1071 is composite. It can be evenly divided by 3: 1701/3 = 567
Composite 3*3*11= 99
Lies! It is composite: 1, 3, 57, 171
9 is the product of 3 * 3, or 3 squared.