Is it "telnet:" or the port 4161 that is telling me that I'm connecting to an UDP server?

I am asking this question because I am not meeting UDP and telnet often... To prepare myself for a development, I am reading a documentation where I will have to connect to a telnet://x.y.z:4161 url. I know, because one at work told me, that it's an UDP server that is behind, but what if I didn't know that, would tell me this? the 4161 port, that is dedicated for UDP exchanges, I think. But could it be also the telnet:// protocol mention that carries this information? What does the telnet: protocol means here? "_I don't know exactly the kind of network communication I have here_"?