No. The concept of prime is defined only for natural numbers greater than 1.
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1 is not a Prime number in counting. It is because you need 2 numbers to be divisible by that number.
Yes, 1 and 1 are relatively prime. Any two integers are relatively prime if their greatest common divisor is 1. This is certainly true of 1 and 1.
Two numbers are relatively prime if they have no factor in common. But a single number cannot be relatively prime.
No, 63 and 74 are not relatively prime because they have a common factor of 1.
Numbers called relatively prime or mutually prime have no common factors or divisors other than 1. Numbers having any common factors or divisors greater than 1 are not relatively or mutually prime.
You might be thinking of relatively prime numbers. Two numbers are considered relatively prime if their GCF is 1. 4 and 9 are relatively prime.