You need at least two numbers to find an LCM. It doesn't matter whether they are prime or composite.
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Yes, the least common multiple (LCM) of a prime number and a composite number will always be a multiple of the prime number. This is because the LCM is the smallest number that is a multiple of both numbers. Since the prime number is a factor of itself and the LCM is a multiple of both numbers, the LCM will always be a multiple of the prime number.
LCM of 27 & 5 = 27 x 5 = 135. LCM of a prime number and a composite number is equal to their product if the composite number is not a multiple of the prime number.
The LCM of a single number is itself. To find the LCM requires two or more numbers.
You could only find the LCM of a PAIR of numbers.
By comparing it with another number.