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Is 28 is prime?
No, it is an even number and it is greater than 2 which tells you right away it is not.The only even prime is 2 itself.
Is 21 relatively prime?
It can be. 21 is relatively prime with 32.
Are 100 and 202 relatively prime?
No, 100 and 202 are not relatively prime. Relatively prime numbers only have the number 1 as a common factor. The number 1 is a common factor for them, but the number 2 is another common factor that they have, so they are not relatively prime.
What is a composite number that is relatively prime to 210?
209 is relatively prime (as is 211).
Are 7 and 21 relatively prime?
27 is not a prime number and i dont know about 117 but i dont think its a composite # * * * * * The person who gave the above answer has no understanding of "relative primes". Or primes, for that matter. Neither 8 nor 9 is a prime BUT 8 and 9 are relatively prime (or co-prime) because they have no factor in common. That is what relatively prime means. 117 is not a prime, even if the previous answerer thinks otherwise. 27 and 117 are not relatively prime because both are divisible by 3.
