Is the Logtalk implementation based on Prolog modules?
No. Logtalk is (currently) implemented is plain Prolog code. Only a few Prolog compilers include a module system, with several compatibility problems between them. Moreover, the current ISO Prolog standard for modules is next to worthless and is ignored by most of the Prolog community. Nevertheless, the Logtalk compiler is able to compile simple modules (using a common subset of module directives) as objects for backward-compatibility with existing code (see the Prolog integration and migration guide for details).
