9595.361
The minimum mass of the protein would be a molecule with exactly 1 iron atom in it. Looking up the atomic weight of iron, you get 55.845. So you can create the equation
0.582% x = 55.845
Get rid of the percent
0.00582 x = 55.845
Divide both sides by 0.00582
x = 9595.361
So the minimum molecular mass of the protein will be 9595.361
