Both. Because there are both even and odd prime numbers.
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There are many, many more odd prime numbers than even prime numbers; there is only 1 even prime number, namely 2, whereas the odd prime numbers are 3, 5, 7, 11, ...
Odd. There is only 1 prime number in the even group: 2. This is because all even numbers above 2 have at least three factors: 1, 2, and itself. There are many odd prime numbers: 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 43, 47, 53, 59...
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
2, 3, 5, and 9 includes one composite number - 9. 3, 11, 23, and 31 are all prime numbers. 2, 5, 15, and 19 includes one composite number - 19. 7, 17, 29, and 49 includes one composite number - 49.
Products of prime numbers are composite numbers.