1. Dr. White helped many people.

(In this sentence, is "Dr. White" a doctor?)

1. Dr. White helped many people.

(In this sentence, is "Dr. White" a doctor at a hospital?)

We don't know.

He could be have a doctorate degree (Phd or EdD) in any academic subject.

Yes, in this sentence "Dr. White" is a doctor. To determine if someone is a doctor, you can look for the presence of the title "Dr." before their name. In this case, "Dr. White" is referred to as a doctor, indicating that they have earned a doctoral degree and are likely a medical professional.