Because they will have more than two factors.
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no it is a prime number (prime means its multiples are only 1 and itself composite numbers can have multiples of many other things)
No. Consider 2 and all other even numbers. Consider multiples of prime numbers, like 3 and 9.
A prime number has only two factors, one and the number itself. Numbers that are multiples of other numbers greater than one have more than two.
It can be. Since 13 is a prime number, it is relatively prime to all other numbers except for multiples of 13.
181 is a prime number. Prime numbers can't be multiples of three.