What departments are those courses in?
SELECT T1.dept_name,T1.course_id FROM course AS T1 JOIN prereq AS T2 ON T1.course_id   =   T2.course_id GROUP BY T2.course_id HAVING count ( * )   >  1
departments of the courses = dept_name from course table; courses that have more than one prerequisite = HAVING COUNT(*) > 1;