Does there exist a PID for each tomcat service? If so, then can we find the service name from that PID of the running tomcat service?

I am working on linux server. I want to know whether there exists a PID for each tomcat service running on any server. If a PID for a particular tomcat service exists, then can we find the service name corresponding to that PID? Can we list all the tomcat services running on the server?