NONSENSE. I don’t know where you learned your estimation skills, but you need to work on them.
Here, let me help. Look at This Link. Look at the third picture down. In the foreground is about 500 people. But the crowd continues off into the distance. See those white banners showing near the top of the frame? Here’s a close-in picture of that area: Close-up view of crowd. There are about 100 people in that picture, and you can see three of those white banners. Now look at that first picture again, and you can see that there are dozens of those banners in the distance.
There are several thousand people in that frame alone, and it’s fairly narrow angle. It covers maybe 30% of the road that rings around the square in the center, and it’s only a single snapshot in time. That demonstration went on for hours. People started at one area and marched to that square. So that picture only represents a smaller percentage of the total number of people that passed through just that section of road, which was only one portion of the area that the demonstration occured in.
Plus, there were simultaneous marches in every major Iraq city other than Mosul and Tikrit.
A few hundred people, my ass.