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    Mathematics
    Grade-4-
    Easy

    Question

    Which of the following numbers is NOT a prime number.

    1. 53    
    2. 57    
    3. 59    
    4. 61    

    hintHint:

    Verifying the given numbers which is not a prime number.
    Prime number :  prime number  is  a number which is only divisible by 1 and itself.

    The correct answer is: 57

      Step 1:
      53 has factors 1 and 53. It is prime.
      59 has factors 1 and 59. It is prime.
      61 has factors 1 and 61. It is prime.
      Step 2:
      Only 57 is NOT a prime number as it has three or more factors like 1, 3, 19 and 57.

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