at least three factors.
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2 factors, but a prime number has only two factors (itself and one). Note that 1 is not considered to be a prime number.
All composite numbers have more than 2 factors whereas prime numbers have only 2 factors
It is: the 'least common denominator'
You need at least two numbers to find an LCM. It doesn't matter whether they are prime or composite.
One has one factor.