Depends. Is there anything in it that we have evidence of outside of the religious texts themselves?
Yes. The earliest is the Deir 'Alla inscription which indicates that Balaam, son of Beor, was indeed revered as a prophet among the Moabites as described in the book Numbers. Altho the inscription has him being a prophet of the gods, not just of
YHWH. Numbers 22 to 24 makes more story sense if in the original tale, Balaam consulted with three gods instead of just one, but it was later revised since there could be no gods except Y
HWH.
