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Prime numbers are positive integers which can be evenly divided only by 1 and themselves. There is no other rule for all prime numbers.
2, 3, 5, and 7.Prime numbers obey the simple rule: Prime numbers can only be divided by 1 and themselves. Which means that they only have two factors.1 is also sometimes considered a prime number, but it is not. It has only one factor, so disobeys the rule.
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.
There is no simple answer because there is no simple rule for primes: it is certainly NOT an arithmetic progression.
Products of prime numbers are composite numbers.