If you want to know for sure which shell you're running, type the command
finger yx2dai
(Others: substitute your own username, of course.)
It will tell you your shell, among other things.
If the prompt doesn't look right, the problem may be that you don't have a
proper .bashrc file in your home directory (one of the things it does is
set your prompt). Don't forget, also, that it takes a few minutes for the
shell change to propagate back to the Linux machines. At any rate, if
troubles persist, come to office hours.
Brad