No; as someone previously observed, each /?id=nnnn, /?page=xxxxx, or /xxxxx entry (be it a word, category, or even forum post) is a kept in a format similar to a wiki page, with a system of templates (e.g. Linear Post for forum posts) that style them to taste and perform various simple functional chores. The actual underlying database is MariaDB, the community-supported fork of MySQL.