Which of the following is not a prime number 157 1057 263 Or 3163
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A number that is divisible only by itself and 1 is said to be a prime number. Here, 157, 263 and 3163 are prime numbers. However, 1057 is not a prime number because it has a more than two factors. 1057 can be divided by 151 and 7. To be a prime number, 1057 should have only two divisors that are 1 and itself.
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