Depends on context. If, for your purposes it would be reasonable to talk about a single datum, then sure, it's plural.

But in common use it's a singular mass noun.

The only people who treat data as plural are academics, usually social scientists, and overeducated journalists. Sentences like, "What do these data tell us?" are awkward for everyone else.

Like "information", "data" is correctly used as a singular mass noun.