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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.
Yup, looks like you won the brownie prize :D
When checking if a given number is a prime, it is sufficient to check up to the square root of a given number. E.g. when checking if 25 is a prime it is sufficient to stop at 5.