'Five' in the Bible

In Susa the citadel the Jews killed and destroyed five hundred men.

Then the king said to Queen Esther, "In Susa the citadel the Jews have killed and destroyed five hundred men and the ten sons of Haman! What then have they done in the rest of the king's provinces? What is your request? It shall be given to you. What other petition do you have? It shall be done."