Two of them.
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The factors of 77 are: 1, 7, 11, 77 The factors of 103 are: 1, 103
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.
Since 103 is a prime number, the prime factorization of 103 is simply 103.
103 is prime, so it's only factors are 1,103
All multiples of 103, which is an infinite number.