Are pure mathematicians, e.g., Algebraists, Number Theorists, Geometers, and Topologists, at good U.S. research universities expected to win research grants to fund their work, in order to gain tenure and be promoted?

If not, are pure mathematicians’ salaries and benefits mainly paid for by the universities which they work for?

I see a lot of questions here on Academia SE that talk about the need to win grant-funding, in order to survive in academia, but I’m not sure whether that applies to pure math professors.