Just four days after advancing to the Champions League quarter-finals, PSG wrapped up the club's sixth French title with eight games to spare by beating a Troyes side destined for an immediate return to the second tier.
Laurent Blanc's men obliterated the French record for the quickest league victory held by Lyon, who won the 2007 title under Gerard Houllier with five games to go.
PSG scored three first-half goals through Edinson Cavani, Javier Pastore and Adrien Rabiot, before Ibrahimovic scored a second-half hat-trick in 10 minutes.
Matthieu Saunier scored an own goal before Cavani bagged his second, Ibrahimovic completing the rout with his fourth.