Mathematics
Grade-4-
Easy

Question

__________ following numbers is NOT a prime number.

  1. 41    
  2. 43    
  3. 47    
  4. 49    

hintHint:

Verifying the given numbers is not a prime no.
Prime number :  prime number  is  a number which is only divisible by 1 and itself.

The correct answer is: 49


    Step 1:
    41 has factors 1 and 41. It is prime.
    43 has factors 1 and 43. It is prime.
    47 has factors 1 and 47. It is prime.
    Step 2:
    Only 49 is NOT a prime number as it has three factors like 1, 7 and 49.

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