Yes, CATECHISM is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, T 1, E 1, C 3, H 4, I 1, S 1, M 3.

Is it a valid word?

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

a series of question put to an individual (such as a political candidate) to elicit their views
an elementary book summarizing the principles of a Christian religion; written as questions and answers