No, a Jew is someone who follows Judaism, one of the oldest religions in the world. Of course, due to people being anti-Semitic for no damn reason, Jew can be used as a general insult.
God Help and the Army of Heaven behind you if you use it in an insulting context near me however.
Most of the time the word "Jew" is not derogatory. Some people may take it offensively, and of course the context the word is used in means everything.