Upvote:6
Yes, you can, that's why it's a multiple entry visa and not a single entry visa. And because it's a Schengen visa, not a Greek visa, it's valid for all Schengen states.
That said, remember that the final decision to let you in will be made by immigration official, so you will still need a reason to visit, proof that you can afford to stay in Europe, some reason to return home, etc.