one (1) and the number itself
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No. Consider 15: 1,3,5,15 Every positive whole number has an even number of factors, unless the number is a perfect square.
No, square numbers have an odd number of factors.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. Since every number has 1 as a factor, 1 is always the least common factor of any set of integers.
Every one of them has an even number of factors.
All non prime numbers have factors that are primes.