Take a look at this article on the Mathnasium website about what types of math young children are able to learn:
https://blog.mathnasium.com/when-should-kids-start-learning-math
-Robert
..
Prime Numbers can only be found using raw computational power, and this man did so:
FedEx Employee Discovers Largest Known Prime Number Containing a Staggering 23 Million Digits
..