No, it is going to have a part 2. Season 4 is going to have totally 48 (but as of now, 12/01/2021, it has 45 chapter chapters in the Manga) chapters.
How many parts are in Attack on Titan Season 4?
Season 4 coming on Dec 7, 2020 will probably have 24–26 episodes and maybe split into two parts. It is also a new animation studio that did Jujutsu Kaisen, Kakegurui, & God Of Highschool. The manga is ending in either December, January, or February, so they'll be able to adapt it properly.
How many episodes will Season 4 of AOT have?
Attack on Titan
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Original release