Did Nostradamus predict Hitler?

No. Nostradamus refers multiple times to Hister--with an "S."  Hister was the name of the River Danube.  It is unlikely that Nostradamus was playing some grand game and disguisiing Hitler's name with an "S."  As Philip Lemesurier notes, in Quatrain IV.68, there is a reference to the Rhine and the Hister, both rivers.  In quatrain II.24, there is a reference to the banks of the Hister, obviously referring to a river.  Finally, as Lemesureir explains, in both Nostradamus' 1554 Prognostication and his 1552 cookbook, the prophet refers to "A very learned man in this last quarter, while walking along the River Hister, also called Danube, the ground subsiding, in the said river shall be lost."  In fact, a councilor of Vienna named Gaspar Ursinus Vellius, had already fallen into the River Danube in 1552.    So no, at least according to scholars like Lemesurier, Nostradamus was referring to a river, and not the tyrant.