src.rpm means that it contains source code for the package. You install it the same as any other rpm package, but you will then have to compile it for the package to work.
A quick search will get you more comprehensive instructions, but usually the steps are...
Go to the directory (rpm -qlp <package>.src.rpm will tell you where that is).
Look for and read any files called "README" and/or "INSTALL".
If they're not there, or if they are there and they don't tell you any different type the following commands.