Factors are whole numbers that divide exactly into a whole number. These numbers have no remainder. Primes, on the other hand, have exactly two factors which are 1 and itself.
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sure, just look at 13x17, that will be a multiple of both. But since both are primes, there are no common factors The LCM of 13 and 17 is 221( by Goldragon845)
Primes and composite numbers have two or more factors, including 1 and the number itself. 1 has only one factor, so it is neither a prime nor a composite number.
16 = 1+15, 3+13, 5+11, 7+92,3,5,7,11,13 are primes < 1616 = 3+13 or 5+11
66 = 2 x 3 x 11
409,457 = 71 x 73 x 79