Yes, DIVIDEND is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, V 4, I 1, D 2, E 1, N 1, D 2.

Is it a valid word?

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

that part of the earnings of a corporation that is distributed to its shareholders; usually paid quarterly
a number to be divided by another number
a bonus; something extra (especially a share of a surplus)