(A square root is that number multiplied by its self)
For example: if you see the number √100, this equals to the number 10, because 10 x 10 = 100
I hope this makes sense...
and when you have the number 4 in front of the square root, this means √7 times 4
So 4√7 = 10.5830052443
and if we multiply 4√7 times its self 4 times, we will get the answer of 12,544
I hope I helped you, God bless