There is only one even, Prime number. It is two (2).
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Both 3 and 5 are prime numbers. 3 x 5 = 15
Only one number can be both even and prime, and that is the number 2.
2 is the only member of both the set of all prime numbers and the set of all even numbers.
86 and 154 are not relatively prime because they are both even numbers. Relatively prime numbers have no common factors other than 1, and all even numbers have 2 as a common factor.
They are both prime numbers.