Yes, DIVIDERS is a Scrabble word!

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

Is it a valid word?

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

a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics
a person who separates something into parts or groups
a vertical structure that divides or separates (as a wall divides one room from another)
a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements