Can UE4 run as server in Linux?

Unity3D has batchmode when some specially way to run it in from command line.
It can be use as server.

If i want implement NPC physic/pathfinding on the server.
I think maybe it can run an client instance on the server to calc this.

So can i use UE4 for it? If i can, how many NPC is maximum for AI/Physic.