There is no "Prince of Persia 4", but the fourth game, the 2003 "The Sands of Time", was indeed released on the PS2. If you only consider the Ubisoft 3D PoP games, you're probably referring to the 2008 "Prince of Persia" (no subtitle) where the Prince is accompanied by Elika. This was not released on the PS2.
1. The Prince Of Persia : Sands Of Time 2. The Prince Of Persia:The forgotten sands 3. The Prince Of Persia : Warrior Within 4. The Prince Of Persia : The Two Thrones (Chronological, not release order, only to the prince's life order.) Prince of Persia (2008) fits nowhere in the series But let's not also forget the older Prince of Persia games: the original Prince Of Persia and the sequel Prince of Persia 2
There are currently 7 PG-13 rated films released under the "Walt Disney Pictures" banner. All 4 Pirates of the Caribbean films, Prince of Persia: The Sand of Times, John Carter and The Lone Ranger. All movies on TopRater: toprater.com/en/movies/objects/2662704-prince-of-persia-the-sands-of-time-2010