First let's see what the funny letters in the equation they gave us means.
F = Gravitational Force
G = Gravitational Constant
m1 = Mass of one of the spheres
m2 = Mass of the other sphere
r = Distance between the two spheres
Ok, now implement it.

To make it simpler
F = 980 x 196 = 192,080
192,080 ÷ 4²
192,080 ÷ 16
= 12005
F = 12,005N