In regular games there are usually 2. In some cases, like in championship games, there are 3 umpires.
It can range from 1-3.In "pool" games there is usually one.In bracket games 2-3And in Championship games 3. It's usually only one umpire. All the games I've played in, there's always been...
Yes, any umpire can throw a coach or player out of the game.
There's a lot to do like pitching, Batting, catching, Fielding, Running.
He calls plays and and pitches.