No, the GCF of 14 and 42 is not 2. The GCF of 14 and 42 is 14, and to find it, decompose both numbers into their factors:
The factors of 14 are 1, 2, 7, and 14.
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42.
As you can see, the greatest common number in both lists is 14, which is the GCF. Read more