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    

Hint:

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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