No, sharks are not mammals, they are fish. The young do not need their mothers. They are independant from birth (or hatching) as all are not born live directly from the mother.

The term ‘mother’ is used loosely as the pups are not eaten by her only because her digestive system is shut down during labor and delivery. If she meets the pups later (and can catch them) she will eat them.

Sharks are kind of like giant guppies (guppies being one or two steps from the bottom of the water world food chain and sharks one, possibly two, from the top) with hundreds of replaceable sharp teeth, an appetite for almost anything, and travelling in groups with a dominance social order that is enforced by violence.