That appears to be a little backwards. It makes more sense to find the GCF of 56 and 154 using prime factorization.
2 x 2 x 2 x 7 = 56
2 x 7 x 11 = 154
2 x 7 = 14, the GCF
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2 x 43 = 86 2 x 7 x 11 = 154 The GCF is 2.
It is: 4
It is: 1
That is not what prime factorization is for.
Whatever you use, you need at least two numbers to find a GCF.