35 and 70, among others.
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The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. If you have only one number - whether or not it is a prime - you cannot have a least COMMON multiple.
You need at least two numbers to find an LCM. IF that's 8 and 3, the LCM is 24.
36
Probably the most common use is in adding fractions with different denominators. The least common multiple of the denominators is the least common denominator. Each fraction can be converted to one with the common denominator, and then you can add the fractions by adding their numerators.
The least common multiple of 7 and 13 is 91. Because the numbers in the set are prime, their LCM is their product.