What is the number that is least whole number and has three different factors?

Methodically:

1 = 1*1 = 1 factor
2 = 1*2 = 2 factors
3 = 1*3 = 2 factors
4 = 1*4 = 2*2 = 3 factors

Therefore, 4 is the lowest number with 3 different factors

1



Explanation:

The keyboard and screen can be thought of as flat rigid sheets of paper. They are joined along one single line which is where the hinge is located. Any two planes intersecting will form a single straight line assuming these planes are not parallel to one another.