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    Mathematics
    Grade-4-
    Easy

    Question

    Find which of the following numbers is NOT a prime number.

    1. 67    
    2. 71    
    3. 72    
    4. 73    

    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: 72

      Step 1:
      67 has factors 1 and 67. It is prime.
      71 has factors 1 and 71. It is prime.
      73 has factors 1 and 73. It is prime.
      Step 2:
      Only 72 is NOT a prime number as it has three or more factors like 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.

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