Probably depends on the college. Some colleges’ economics majors require substantial math like multivariable calculus. Some require single variable calculus. Some require no calculus at all. Some offer different economics major options with different levels of math required.
Yes, economics PhD programs prefer applicants to take substantially higher level math and statistics courses than those normally required by economics major degree programs. Examples include real analysis, calculus-based probability theory, proof-based linear algebra. See https://www.econ.berkeley.edu/undergrad/current/preparing-for-grad-school .