Multiples of 4, like 4, 8 and 12.
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4 and 8, among many others.
Respectively, they are 3, 7, 5 and 7 but those four numbers do not have a common prime factor.
All numbers have factors. Some factors are prime numbers. A prime factor is a factor that is a prime number. A common prime factor is a prime factor that appears on the list of factors of two or more given numbers.
1 is a factor of every whole number, and the gcf of two numbers can be 1 if there is no larger factor common to both numbers.
2 is a divisor of all even numbers, and a divisor is a factor of all numbers which can be divided by it.