Can FME server run multiple jobs at same time?

one engine one fme workspace.

if you have 8 engines then, you can run 8 workbenches at a time.

Go to settings and check for how many engines.

Thanks. Is one engine one license?

One engine =one fme instance to run

Each engine instance needs to be associated with either a standard or a dynamic engine license, see https://docs.safe.com/fme/html/FME_Server_Documentation/ReferenceManual/engines.htm

Thanks