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    Mathematics
    Grade-4-
    Easy

    Question

    ______ one of the following numbers is NOT a prime number.

    1. 11    
    2. 13    
    3. 15    
    4. 17    

    The correct answer is: 15

      Step 1:
      11 has factors 1 and 11. It is prime.
      13 has factors 1 and 13. It is prime.
      17 has factors 1 and 17. It is prime.
      Step 2:
      Only 15 is NOT a prime number as it has three or more factors like 1, 3, 5, 15.

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