In a school dance programme, 2507 students are to be arranged in a square formation, where the number of rows is equal to the number of students in each row. The teacher notices that not all students can fit perfectly into the square.
1. Find how many students were left out in the arrangement?
2. How many number of students forming a square?
3. When arranged for dance, number of rows is equal to
4. Find the number of students in each row of the square.