ANSWERS: 3

No, it's not. It's divisible by 3. (and 19)

No, it's not a prime number. Don't you know what 3 times 19 is?


beaker95Is it 42....?


57 has an aliquot sum of 23 and is the first composite member of the 23aliquot tree. Although 57 is not prime, it is jokingly known as the "Grothendieck prime" after a story in which mathematician Alexander Grothendieck supposedly gave it as an example of a particular prime number.
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