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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It's highly unlikely that you will get anywhere if you do not use some very specific number theory theorem. I think you just need to do some more research, until you stumple upon some particular approach.
Assert::That(sum_of_squares(661915703), Equals(4));It would be good if you stated the langauge you are attempting, it would help us to check tests.
You can also read this paragraph: https://docs.codewars.com/training/troubleshooting#print-input and the one directly following it.