Yes, HEJIRA is a Scrabble word!

Letter values in Scrabble US: H 4, E 1, J 8, I 1, R 1, A 1.

Is it a valid word?

HEJIRA is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the flight of Muhammad from Mecca to Medina in 622 which marked the beginning of the Muslim era; the Muslim calendar begins in that year
a journey by a large group to escape from a hostile environment