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231 is NOT a prime number. It is divisible by 3, 7 and 11.
They are: 3*7*11 = 231
231 = 3 x 7 x 11
A fundamental theorem in mathematics is that of unique factorisation. Any number can have only one prime factorisation. 231 = 3*7*11
13 is the greatest prime that needs to be checked to determine if 231 is a prime.