Doesn't Know That Dinosaurs Reigned Supreme; When Mammals First Evolved Some 200 Million Years Ago

The Bible does mention a dinosaur in Job 40:15-24. But instead of calling it a dinosaur, the Bible calls it a "behemoth".

https://answersingenesis.org/dinosaurs/could-behemoth-have-been-a-dinosaur/?srsltid=AfmBOoqYS4dpCV1ty-ocw_BZMVRaX50eT3M8YEmqF-e379wG-bmRP_OT

Was it said to have been there before humanity?

God was showing a dinosaur to Job in that chapter, so the chapter is saying that dinosaurs lived at the same time as humans.

Here's another article that you might enjoy:

https://biblicalculture.com/dinosaurs-their-creation-cohabitation-with-humans-and-extinction-according-to-the-bible/