Ryan Gesiakowski scored 10 points and DeMuynck finished with a game-high nine boards to help the Panthers (10-14, 5-6) outrebound Grambling State 41-37 and outscore them in the paint 26-20.
Ahead 28-22 at halftime, Prairie View A&M opened the second half on a 12-2 run to go up 40-24 with just over 14 minutes remaining.
Montgomery led Prairie View A&M with 13 points, as the Panthers shot 50 percent (13 of 26) in the second half. Prairie View A&M led the entire game.
Grambling State shot 35.7 percent (20 of 56) for the game and trailed by as many as 17 points.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.
Mike Brey is looking at former Notre Dame players to fill two assistant jobs that have opened up with the departures of Martin Ingelsby and Anthony Solomon.
Purdue's 2016-17 prospects got a jolt Wednesday when forward Caleb Swanigan announced he will return for his sophomore season.