You can enable 2-factor authentication (2FA) for Google accounts. And You can find more information in this following document. Keep in mind Google Cloud Project does not have an isolated service to enforce 2-Step Verification for the accounts of a project. However, there is a feature request on our side. Instead, Cloud Identity offers the identity services and endpoint administration that are available in G Suite as a stand-alone product. As an administrator, you can use Cloud Identity to manage your users, apps, and devices from a central location—the Google Admin console.
You can set up Cloud Identity as an administrator by following these steps.
Also, I invite you to take a look at this thread on StackExchange that explained about the difference of2-step verification" and 2 factor authentication.