Eleanor Mann School of Nursing University of Arkansas

I would like to be a registered nurse, and am considering the University of Arkansas. I was a little confused as to how to get into the nursing school, as it has many prerequisites… Do I have to get a bachelors degree before I can go to nursing school? Or do I just have to take the prerequisites and then I can go to nursing school? If that is the case than wouldn’t it take longer than 4 years to be a nurse? Also if that is the case then what do I go into college with my major as?