Mathematics
Grade-4-
Easy

Question

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

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

Hint:

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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