That's probably Google's Phone app. It's to help them improve their Caller ID, Call Screen and similar functionality. Overall, it's a powerful function, but it has to depend in part on crowdsourcing, because the databases Google has access to won't necessarily specify if a certain number is personal or business. If you really don't want those prompts, you probably have to turn off those features in the Phone app's settings -- but then prepare for a deluge of spam calls.