There is no relatively Prime number for 10. Relatively Prime numbers are sets of two or more numbers having 1 as their greatest common factor (gcf). All even numbers have 2 as a common factor, so no even number is relatively prime with any other even number.
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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.
Two numbers are relatively prime if their greatest common divisor (GCD) is 1. In other words, there is no positive integer greater than 1 that divides both of the numbers. For example, 7 and 12 are relatively prime, but 10 and 15 are not, as their GCD is 5.
It is, and always is relatively prime.
Any two different prime numbers are relatively prime because relatively prime numbers are sets of two or more numbers having 1 as their greatest common factor.
When two numbers are relatively prime, the LCM will be their product.