In some contexts, can be, but not in the basic one.
From Wiktionary, this I guess would take singular:
- (plural peoples) Persons forming or belonging to a particular group, such as a nation, class, ethnic group, country, family, etc; folk; a community.
No, it's not, it doesn't end with a question mark. I thought that perhaps it sounded like a question (that's what our TTS tends to do), but it even sounds right.