No, they are not.
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No. Both are divisible by 5.
If the least common multiple of two numbers equals the product of the two numbers, then the numbers are relatively prime, that is their highest common factor is 1. For example, the numbers 10 and 21: The lcm is 10 x 21 = 210 They are relatively prime since their hcf is 1.
There are more than 10 prime numbers
Two numbers are relatively prime if the only factor they have in common is 1. The factors of 12 are 1, 2, 3, 4, 6, and 12. The factors of 25 are 1, 5, and 10. The only factor they have in common is 1, so they are relatively prime.
All numbers not divisible by 3 or 9 are relatively prime to 9. This would include 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, etc.