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    Mathematics
    Grade-4-
    Easy

    Question

    Identify one of the following numbers that is NOT a prime number.

    1. 28    
    2. 29    
    3. 31    
    4. 37    

    hintHint:

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

    The correct answer is: 28

      Step 1:
      29 has factors 1 and 29. It is prime.
      31 has factors 1 and 31. It is prime.
      37 has factors 1 and 37. It is prime.
      Step 2:
      Only 28 is NOT a prime number as it has three or more factors like 1, 2, 4, 7, 14, and 28.

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