It depends. Constipation is the inability to have a bowel movement. Some patients only have a bowel movement once every 3 days, but they are not constipated. However 95 percent of patient should have a bowel move within days. Patients who only go to the bathroom 2 times or less per week are constipated. If the is a new symptom, you should see a gastroenterologist.
Hard stools. Excessiveley hard stools or dessicated stools. Fecal material with less water content.
See below. Constipation occurs when you are not emptying your bowels well - often the stool is hard and dry. Try to eat at least 5 servings of veggies per day & 4 of fruit. Hydrate well. Avoid junk carbs & don't overdo the dairy. Stay physically active.