The numbers need not have any common factor other than 1. For example, consider 2*5 = 10 and 3*7 = 21.
10 and 21 are both composite but their GCF = 1.
They are said to be relatively prime or coprime.
No.
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There are 15 composite numbers greater than 50 but less than 70
All even numbers greater than two are composite.
38 is a composite number because composite numbers are numbers that have more than 1 and themselves as factors. 1x38 is not the only solution, so it isn't prime. One solution for this could be 2x19
86 is composite, because it has factors other than 1 and itself. The factors of 86 are 1, 2, 43, and 86. All even numbers greater than 2 are composite.
A whole number greater than 1 that has more than two factors is called a composite number. 4, 6, 8,9, and 10 are just a few examples of composite numbers.