None of them are divisible by two.
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They are all odd, and they are all prime numbers
Yes, the factors of all odd numbers are odd numbers.
Half of all square numbers are odd. They are the ones which are the square of an odd number.
All of the prime numbers are odd except for two.
Yes.Yes.2 can never be a factor of an odd number and because of that it can't be a common factor of any number pair where at least one of numbers is odd.