What is the process to get the port no used by katalon?

In order to integrate katalon with remote jenkins, I need the port number to which katalon uses.

No you dont. You have to properly setup jenkins with remote nodes (usualy is via ssh port 22 but here is a longer story)
Check the jenkins docs.

Thanks for the reply.
I guess, port 22 is for linux machine.

But we have Katalon is installed in Windows machine

@suma.betigiri without detailed info about your intended setup, this is what you can get
I strongly recomend to read jenkins doc. This is not a katalon issue