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There's an excellent quotation attributed to Alexandre Grothendieck, one of the greatest mathematicians alive. At a seminar he was giving on analytic number theory, someone suggested that they should consider a particular prime number. "You mean an actual number?" Grothendieck asked. The other person replied, yes, an actual prime number. Grothendieck replied "All right, take 57."

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Is there a significance to 57 there?

57 isn't a prime number. 3 * 19 = 57

Yes, it isn't prime, that's the joke (I guess).

Yes, but not in the sense that Grothendieck made a joke by saying '57', but in the sense that Grothendieck, who knows quite a bit about prime numbers, said '57' without realizing that it is composite.

Yes, I understood it in this sense too :) Quite a character, Grothendieck.

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