Unless you have a specific list, as a general rule, any nonzero whole number can be a factor.
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All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a common factor of 9 and 12.
Yes. 1 and the number itself are factors of all numbers.
Prime numbers are 3 and 2. Factors are 1,2,3,6.
Product
Yes. Square numbers have an odd number of factors. 49 has three factors.