Small doubt on xterm

My manager asked me to do xterm the particular server...I tried as below..getting permission denied. I asked my manager same...he suggesting you need to setup a profile..i'm not sure what he is talking about.

$ xterm -display 136.151.221.212:0.0 -sb -sl 1000 &
[1] 30076
$ ksh: xterm: 0403-006 Execute permission denied.

[1] + Done(126) xterm -display 136.151.221.212:0.0 -sb -sl 1000 &

Any one have idea about this ? pls help me.. I'm in learning process...

what are the permissions on xterm.

ls -l `which xterm`