Can single variables be called prime factors?

Question

Prime factor decomposition of a term like 10y²z³ gives some prime numbers and single variables, e.g., 2×5×y×y×z×z×z. In this example, 2 and 5 can be called prime factors, can't they? Can y and z be called prime factors also? If "no," is there one name suitable both for the prime numbers and single variables that we obtain after the prime factor decomposition? Thanks a lot in advance!