Is the sun hot?

Yes the sun is hot, however the surface of the sun is approximately 10,000 degrees Fahrenheit, or as the rest of the world would recognise, 5,500 degrees Celsius.

At the core however, temperatures are much hotter, 27 million degrees Fahrenheit (15 million degrees Celsius) which is necessary to maintain the fusion reaction which provides the warmth we feel. Once all the hydrogen is convert to helium with fusion, the sun will no longer exert external pressure and will likely become a neutron star.