Yes, our Sun is actually white. The depiction of being yellow (or orange or red) comes from the scattering properties of our atmosphere. The long wavelengths (violet, indigo and blue) get scattered more than the yellows, oranges or reds hence the Sun just *looks* that color especially around sunrise or sunset when it is seen through the most atmosphere. Get out in space and she is a bright white blob. And the G2V rating is in reference to how *hot* it is. Around 5600K to 5800K. It is a measure of the solar flux or how fast and how much material is being converted while on the main sequence.