Suppose that we survey $500$ randomly selected Country $X$ voters about whether or not they think Mr.A should leave the race, and $254$ of the $500$ voters say "yes". Test the hypothesis that greater than $50$% of Country $X$ voters believe that Mr.A should quit the race. Find the $p$-value for this test. What does the value indicate, or mean?

How do I do this hypothesis testing problem? Help would be much appreciated.