Checkmate or stalemate?

At LEAST 2 Queens?  You're just asking for a stalemate.  Remember that if your opponent is down to the King, he needs to be able to safely move without putting himself into check.  Multiple Queens make it harder for him to find a safe square.  Many chess players prefer to let the opponent keep a pawn or two just so he always has something to move.  I'll get the stalemate article for you...

https://support.chess.com/article/682-what-is-stalemate

You should learn how to avoid stalemate and basic checkmate with king+rook or king+queen.

The situation depends. Getting two queens generally makes things easier, and you have to be careful of stalemate even with one queen. Three queens are unnecessary and asking for stalemate. Keeping one or two of your opponent's pawns generally is good, unless you're losing on time. If you are low on time take all the pawns! If you run out of time, and your opponent just has a king, or a king and minor piece, then it is a draw! If you run out of time, but your opponent has pawns left, then you lose! Something to keep in mind at the end of a game.

Ez stalemate 

If you have 2 queens, there is no way someone cannot stalemate. A stalemate means the king is in a safe square and there is no legal move. A checkmate is when the king is in a dangerous square and there is no legal move. Make sure to think before you move in this situation.

There is a way, it's called being careful. It's harder to mate with one queen and you still have to watch out for stalemate at the end of the sequence.

Its a glitch

Yeah, just make sure you give a check all the time!

Go to puzzle, end games . Practice them. Helped me massively