Engine-off (so-called "dead stick") landings are absolutely possible even in a commercial aircraft, and are something you practise pretty much from day 1 of flight training:

https://en.wikipedia.org/wiki/Deadstick_landing#Deadstick_la...

Yes. You'd want a longer runway (no thrust reversers and less fine control for where you are landing), but then see US Airways 1549 (https://en.m.wikipedia.org/wiki/US_Airways_Flight_1549?wprov...).