5, 13, 17, 29, 37, 41, 53, 61, 73, 89, 97 to name the ones under one hundred.
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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.
Yes, there are many more composite numbers than prime.
3,7,11,19,23,31,43,47,51,59,67,71,79...
70, it is a multiple of 2 and 7 is more than 50 but less than 100 and 2*5*7=70 and all those numbers are prime.
If the second number is a multiple of the prime number, than the LCM is the second number. If the second number is not a multiple of the prime number, then the two numbers are relatively prime, and the LCM is the product of the two numbers.