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Prime numbers are those numbers that can only be divided evenly by 1 and themselves. For example 7 cannot be divided evenly by 2, 3, 4, 5, or 6. It is prime. On the other hand 9, can be divided evenly by 3. Therefore it is not prime.
Yes, by these numbers: 1, 3, 17, 51.
Yes, by these numbers: 1, 3, 23, 69.
The common prime factors of 18 and 36 are 2 and 3. Both numbers can be divided evenly by 2 and 3.
63 is divided evenly by these numbers: 1, 3, 7, 9, 21, 63.