If I have CS4 (which I do) do I therefore have Premiere Pro CS4? If not, can I still get Premiere Pro CS4 either free or for a price? If not, can I get Premiere Pro CS5 without getting the entire CS5?
The designation "CS" for Creative Suite, applies to various Adobe products. Exactly which version of CS 4 do you have?
That will tell whether you have PrPro CS 4 - some CS 4 suites contained it, and some did not, like Web Premium, etc.