If (7)(x^2) has four different prime factors, at most how many different…

If (7)(x^2) has four different prime factors, at most how many different prime factors does x have?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #97080