Answer:
66 is a counter-example to the given conjecture.
Explanation:
A counter-explample can be defined, in logic, as an exception to the rule, in this case, an example that shows the conjecture is wrong. This method is used to demonstrated a given "function" or statement.
So, we just need to find one case where a number can be divided by 2 but not by 4, which is 66, because

Therefore, the conjecture is wrong, because there's a case where a number can be divided by 2 but not by 4.