False - 2 + 11 = 13.
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2 is prime
False
No because 2 is an even number which is also a Prime number that has only two factors which are itself and one.
Two composite numbers may or may not be relatively prime, depending on their factors. 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.
The answer to the first question is true. The answer to the second question is because if the number could be divided by anything but itself and one, then it would not be prime, it would be composite. That is simply the definition of a prime number.