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The prime factorization of 411 = 3•137. The number 411 is not a prime number because it is possible to factorize it. In other words, 411 can be divided by 1, by itself and at least by 3 and 137.What number is 411?
In the US, "411" is the telephone number for directory assistance: 4-1-1. The linked Wiki page gives a decent history of the use of "411" in the US, which was used as the directory service number in New York and San Francisco by 1930.