no
Romans actually spoke Latin. Also some greekRomanian is one of the Romance languages, which is derived from the Roman Latin language.
There is no Roman alphabet. It's called the Latin alphabet, and yes, the Romanian alphabet is a variety of the Latin alphabet, just as English is.
The Romanian language word is also roman (if you think to Roman empire).
Romans are from Rome Italy Romanians are from Russia. Romania is a country or state inside Russia.
Basically, yes. They were the main system of numbers used by the Romans. There were minority numeral systems in Rome, of which is still unknown.