Find a counterexample for the statement.
if p is prime, then
p2 + 4
is prime.

If p is prime , then p could be 2.

p² + 4 could also be prime?  p = 2

2² + 4 = 4 + 4 = 8,  8 is not prime.

Therefore p = 2 is a counter example. In the sense that p = 2, does not support the statement that p² +  4 which is 8 in this case is a prime.

So p = 2 is a counter example.

Is there more to the question?