Hi RR,
Prostate Cancer can have no symptoms or a few others such as not going to the loo or going more often. All the symptoms can also be just inflammation coupled with perhaps muscle pain. When you start worrying and digging into it all seems to look worse.
A GP should be asked, they'll give you a few checks such as feeling up your bottom and decide if to do a blood test or other. If you're worried, or even if you're not worried, that's the place to be whatever it is.
If the burn is when you pass urine I'd think it's more likely to involve inflammation or an infection. But I'm not qualified to judge. All the best Peter