Seventh grade students from a school line up and form a square array. There are $196$ students in the outermost layer. How many students in total are there in this array? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Squares->Solid Squares
The number of students on each side of the outermost layer was $$196\div 4+1=50$$. The total number of students in the array was $$50\times 50=2500$$. 