4,6,8,10,12,14,16,18,20,22,24,26
All numbers with 12 as a factor have 2 as a factor, but not all have 10 as a factor.
1 and 3
It is, because 2 is a common factor for all even numbers.
4 is not a factor of 18 and is a factor of both 8 and 12
2 x 2 x 3
12 and 72
the highest common factor of the numbers 12, 16 and 18 is 2.
2 and 3 are prime numbers that are factors of 12. There is an infinite list of prime numbers that aren't.
24 and 36
6 and 12
12 is not a factor of 124.
2 and 12, among others.