Which of the following is NOT a prime number?
a 263 b 3163 c 157 d 1057
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A prime number is a number that is divisible by only itself and the number 1. Except for the number 2, all prime numbers are odd.
In this case, 1057 is not a prime number. Apart from itself (1057) and 1, the number is divisible by both 15 and 7.
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