Is a 2hour stopover long enough for a connecting flight?

Yes it is enough

Yes and no . It all depends on if your flight was not delayed. 95 percent of time you are fine with 50 minutes or more layover. This is why you book with major airlines. If connecting flights missed . They just reroute you or a later flight.. this is why early flight s before 10 am are usually best to get to your destination on time.

Yes

Yes, plenty!

Absolutely