Once upon a time, there was port of the Quintus Prolog GNU-Emacs package for GNU-Emacs 18. This package has been dropped from the distribution because it didn't work on Emacs 19 and 20.
The default Prolog mode for GNU-Emacs can be activated by adding the following rules to your Emacs initialisation file:
(setq auto-mode-alist
(append
'(("\\.pl" . prolog-mode))
auto-mode-alist))
(setq prolog-program-name "pl")
(setq prolog-consult-string "[user].\n")
;If you want this. Indentation is either poor or I don't use
;it as intended.
;(setq prolog-indent-width 8)
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If anyone has a better suggestion, please make this public.