I you still have the source installed that you used to compile apache, you can try: make uninstall. Sometimes the uninstall option is included. I don't know if it is with apache.
I definitely would not recommend deleting anything with http in it.
You might mount the Suse cd that has apache rpm on it. Then use this to display a listing of the files it contains. This will give you an idea of what was installed. More then likely however the rpm will be installing apache in a different place. Compiling apache from source probably put most of the files in /usr/local.
rpm -qpl /full/path/to/cd/apache-whatever.rpm
Of course you don't have to use the full path if are already in the directory where the apache rpm is.