The GCF is 3.
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No, 2 is not a factor of 309 because it does not evenly divide into 309. The factors of 309 are 1, 3, 103, and 309.
215
Eventually
103
1, 2, 3, 4, 6, 8, 12, 24 1, 3, 103, 309 1, 3, 9, 37, 73, 111, 219, 333, 657, 2701, 8103, 24309