Not with negative numbers. -10 is a multiple of -2.
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No, for any number n greater than zero, the LCM of n and n is n.
33 is the first composite number that is greater than 30 but is not a multiple of 2
No number between 61 and 107 is a multiple of 41020. A multiple is a number that another number can divide into. The lowest multiple of any number is itself. You may have meant factors, which is a number that divides into a multiple of itself. In that case there is a factor of 41020 between 61 and 107. That number is 70.
It is not possible for any multiple of a prime number to be prime.
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.