Which of the following is not a prime number?

  1. 31
  2. 61
  3. 71
  4. 9124
Monis Rasool Professor Asked on 21st May 2015 in Maths.
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    Ans. 91 is not a prime number.

    Reason:-  91 is divisible by 7 and 13.

    Prime number is that numbers are not divisible by any other number.

    Anurag Mishra Professor Answered on 22nd May 2015.
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