If u have to change it in negative it will be like this:
He is not an entrepreneur.
If u have to change it in interrogative then it will be like this:
Is he an entrepreneur?
Do you want to know what those prefixes mean?
Explanati I L I K E B O O T Y
Answer:
I'm really happy for you that you made that decision and I think it's a really good goal, it'll really help you so many ways now and in the future