There are different ways of doing this. I'll show some of the solutions then you'll find the rest.
Solution 1: The easiest way to divide the square into 4 equal parts is to draw three vertical lines or three horizontal lines forming four (4) equal areas. This can be shown in the figure below, where each part is shaded with a different color.
Solution 2: Another way of dividing it is to draw one vertical and one horizontal line intersecting at the middle part of the square. That is
Solution 3: Another way of dividing it is to draw the diagonals of the square.
Solution 4: You can also cut the square by a horizontal line or a vertical line, then cut each half into two equal triangles.
There are still other ways of dividing a square into 4 equal parts. Find them and share them here... comment below.