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19 February, 14:33

Which of the following is not a prime number? A-3163, B-263, C-157, AND D-1057

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  1. 19 February, 14:36
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    We know that the prime numbers are divisible only by 1 and by itself.

    Those numbers are: 2, 3, 5, 7, 11, 13, ...

    And also:

    1057 : 7 = 151

    So number 1057 is divisible also by 7 and 151.

    Answer:

    D - 1057 is not a prime number.
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