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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.
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Probably. Apparently there's not a test for that. Although, really, the kata doesn't specify what you should do if a number is 1. If the number has divisors, you print them. If the number is prime, you say it's prime. What do you do for 1? Empty string? Something else?