What was IQ of Einstein?

Could you please elaborate on the notion of Albert Einstein's IQ, and how it relates to his remarkable contributions to science and mathematics? Is there a definitive number that encapsulates his intellectual prowess, or is it a subject of debate among scholars and experts? Furthermore, how does Einstein's IQ compare to that of other renowned figures in the field of science and academia, and what insights does it offer into the complexities of human intelligence and genius?