Except Prussia stopped being a Polish vassal in 1618 and didn't exist until 1525. That's less than a hundred years, compared to Prussia's existence as a state named 'Prussia' that lasts until 1947.Second peace of Thorn(1466) - 1795 is 329 years. 1796 - Unification of Germany (1871) is 75 years. Do the math.
Enless you count Germany as Prussia.