What is the unit digit in {(6374)^1793 x (625)^317 x (341)^491)}

What is the unit digit in {(6374)^1793 x (625)^317 x (341)^491)}?

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 #29069