It is: 3*7 = 21
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21
It is 3 time 7 = 21
Product of the two prime numbers is the LCM. For example 3, 7 have 21 as LCM
21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers
21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.