जॉइन Examsbook
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प्र: Which of the following is not a prime number?

  • 1
    5
  • 2
    11
  • 3
    21
  • 4
    37
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उत्तर : 3. "21"
व्याख्या :

Answer: C) 21 Explanation: A prime number is a whole number greater than 1 whose only factors are 1 and itself.   Factors of 5 are 1, 5 Factors of 11 are 1, 11 Factors of 21 are 1, 3, 7, 21 Factors of 37 are 1, 37.   Hence, according to the definition of a prime number, 21 is not a prime number as it has more than two factors.

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