Yes, IDEOLOGICAL is a Scrabble word!

Letter values in Scrabble US: I 1, D 2, E 1, O 1, L 1, O 1, G 2, I 1, C 3, A 1, L 1.

Is it a valid word?

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

of or pertaining to or characteristic of an orientation that characterizes the thinking of a group or nation
concerned with or suggestive of ideas