No.
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Oh, dude, "relatively prime" just means two numbers have no common factors other than 1. So, numbers that are relatively prime with 18 are ones that don't share any factors with 18 besides 1. In this case, numbers like 1, 5, 7, 11, 13, 17, and so on are relatively prime with 18. It's like 18 is at a party, and these numbers are the cool kids who don't have any drama with it.
Lots of numbers are. To be relatively prime, they would have to have only the number 1 as a common factor. So any number that has any of 2, 3, 6, 9 or 18 as factors are not relative prime to 18. So numbers such as 5, 7, 11, 13 and 17 are relatively prime with 18.
The GCF of 18 and 49 is 1. These numbers are relatively prime
Yes, they are. 5 is the only prime factor of 25 and 5 is not a factor of 18, so they have no prime factors in common, which is what relatively prime means.
The prime numbers (factors) of 18 are: 2 and 3