All even numbers greater than 0 have 2 as a factor.
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Actually they do because only even numbers have 2 as a factor.
Even numbers have 2 as a factor. 6, 178, 46
The common factor of 1, 2, and 4 is 1.
Of course not. In fact, the greatest common factor of two odd numbers is never 2.-- 2 is never a factor of any odd number.-- The greatest common factor of the odd numbers 651 and 1,085 is 217.
2 is a prime number.