how many episodes are their?

As of now (season 15 and a half), there are 216 episodes.

I think the other answerers are confused with the "episode numbers" which state the season (15) and the episode number of that season (07). So 1507 is the episode number. They're usually used to describe individual episodes. Hope that made sense!

1507 I think...gosh I don't keep count

I think there are, 1502, but I know someone who can answer this for sure.

about 207

Currently theres has been 216 eps (:

Yeah...it's not hard to find the answer to that.

Oh, look! Wikipedia!