Are Prime Lost series lost by canceling Prime?

So I just recently bought Amazon Prime and downloaded a series that it otherwise z.b. Not on Netflix. Since I actually needed Amazon Prime just because of this one series, I would like to cancel it soon. My question: if I cancel Amazon Prime, this series is also automatically deleted from my downloads (in the app)? Or not, since I can already look at it offline and therefore maybe not need a Prime?

Btw: the series was free with Prime, just for info.

Not deleted, but you can't play the series without Prime.

Would otherwise be too easy, and would favor copyright infringement.