1. Write a Python class, Square, constructed by a side and two methods which will compute the area and the perimeter of a square. Include the constructor and other required methods to set and get class attributes. Create instances of Square and test all the associated methods.

2. Write a Python class, Employee which has attributes employee_id, employee_name, number_of_years employed, and salary. Include the constructor and other required methods to set and get the class attributes. The class should add an incentive of 3% to the total salary if the number of years worked by the employee is greater than 5 years. Create 2 instances of the class and display the total salary of the employee along with the other associated attributes.