The default port for OpenVPN tunnels, usually over UDP for performance, with TCP available for networks that block UDP or interfere with it. Traffic on it is a full encrypted tunnel, so everything inside is opaque to the network it crosses.
Designed to be exposed, which is the point of a VPN endpoint. Keep the software current and use certificates rather than shared secrets.
Open 1194 is expected on a VPN endpoint. Keep OpenVPN patched and prefer certificate authentication over a shared static key.
The port scanner will tell you whether 1194 is reachable on a host you control. Checking from outside your own network matters: a port can be open on the machine and still be blocked at the firewall, and it is the view from the internet that decides whether anyone else can reach it.
Only scan hosts you own or have permission to test.