4 and 9
8 and 27
25 and 49
16 and 45
12 and 35
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Both 2 and 5 are prime numbers because they have only two factors whereas composite numbers have more than factors.
There is an infinity of pairs of numbers with a GCF of 4. If p and P are two distinct primes, then 4p and 4P are such a pair. There are other ways to construct such pairs, but one infinity should suffice.
The ones that are relatively prime, or co-prime.
12=5+7
The factor pairs of 215 are 1, 5, 43, and 215
They are both primes so the gcf is 1.