Is Girls & Panzer Movie: 3-pun Chotto de Wakaru!! Girls & Panzer hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Movie · 2015 · 1 episodes · PG-13 - Teens 13 or older
CGDCT, Military, School
A 3-minute intro screened in theaters at the start of the movie. It recaps the TV series to give viewers some context before watching the film. (Source: AniDB)
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