SOLUTION: Find a counterexample to the statement “The square of a number added to the sum of the number and five is a prime number”

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Question 112012: Find a counterexample to the statement “The square of a number added to the sum of the number and five is a prime number”
Found 2 solutions by jim_thompson5910, adcoy:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
If you let the unknown number be 4, then we get

4%5E2%2B%284%2B5%29=16%2B9=25


Since 25 is not a prime number, this means we found a counterexample for the given statement.

Answer by adcoy(3) About Me  (Show Source):
You can put this solution on YOUR website!
4, 4 squared is 16, 4+5 = 9, 9+16 = 25, 25 is not prime