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.
Former Kentucky guard Ed Davender, the only Wildcat with at least 1,500 points and 400 assists, has died. He was 49.
Guard Naz Mitrou-Long, whose 2015-16 season ended in December due to hip problems, has been granted a hardship waiver for the coming season, Iowa State said.
As the Sooners look to life without superstar Buddy Hield and his sidekicks, it's clear their unseasoned players will need to grow up fast.