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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.
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Neither 3 nor -3 is a factor of -35. Factors of -35 are 1,5,7,35 and, if you count negative factrs too, there are -1,-5,-7,-35. Out of all of these, the only prime numbers are 5 and 7.
-5 is not a prime number, so it should not be listed as a prime factor.