2 and 3, for a start.
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Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
none
The prime factorization of 56 is 2, 2, 2, and 7, so there there are two prime numbers, 2 and 7, that can evenly go into 56.
These numbers go into 634 evenly: 1, 2, 317, 634.
2 & 103