Are great white sharks considered mammals?

No, great white sharks are not mammals. They are fish, specifically cartilaginous fish.

Here's why:

* Mammals have mammary glands to produce milk for their young, breathe air with lungs, have fur or hair, and are warm-blooded.

* Fish, on the other hand, breathe underwater using gills, have scales, and are cold-blooded.

Great white sharks, like all sharks, fit the description of fish.