Question

I just need a quick explanation on this.
Like a fast way to grasp this concept.
I don't really understand how I would know wether reactants or products are being favored in an Equilibrium problem.
Ex:
K=[I]^2/[I2]..
- I know that that the top is the Conc. product.
-The Denominator is the Conc. Constant.
How would I figure out which one is being favored?
*I already have the answer by the way and it's that the reactant is being favored.. But i don't understand why..
I would really appreciate some help!!(: