Potatoes are very healthy for you so eating potato soup is a healthy food but avoid eating too much potato soup in a short amount of time because potato soup contains some saturated fat as well as 190 to 200 calories which is not good if you're trying to lose weight.
If you do want to eat potato soup and keep it healthy avoid adding things such as bacon or cheddar cheese since those two things up the calories and fat content of the potato soup.
Plain potato soup is much healthier for you than loaded potato soup.