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No, 12 and 18 are not prime to each other. Two numbers are considered prime to each other if their greatest common divisor is 1. In this case, the greatest common divisor of 12 and 18 is 6, not 1. Therefore, 12 and 18 are not prime to each other.
Numbers with their Greatest Common Divisor (GCD) as 1 are called to be as relatively prime to each other.
Prime numbers that are next to each other on the list of prime numbers.
343 and 432 are relatively prime to each other.
59 and 97, being both prime, are relatively prime to each other.