No.
GCF(68, 72) = 4.
6 is not a prime number but it is a factor of 72
The GCF of 28, 68, 72 is 4.
3 is a prime factor of 72 and is contained in the prime factorization.
The greatest common factor (GCF) of 68 and 72 is 4.
9 is not prime, so it is not a prime factor of 72, great or otherwise.
2
33 is not a factor of 72.
The GCF is 4.
Three.
The greatest common factor of 25 and 72 is 1, so they are relatively prime.
There is only one GCF of 48 and 72 and it is NOT prime. The greatest common factor of 48 and 72 is 24.