If you mean in the book of Psalms, there are 150. In addition to these, there are others that are not included in the Old Testament, the so-called psalm 151, 152 plus a few others. These also stem...
The question is not clear at all. How many prophets, books, miracles, leaders are you asking about.
There are a total of 39 books in the old Testament.
56 starting with Aaron's rod changing and ending with Jonah in the whales belly
600