Yes, God can make 2+2+5 and all those other things... But we are limited to the dimension we live in and our minds cannot understand what lies beneath that. Maths is part of OUR dimension, so is circles and squares and all other shapes, you cannot see the shape of another dimension, but it does exist. Colour is aonther constriant on OUR dimension, so is physics and all the stuff you can think of. God can make a rock big enough that He can't move it and in the same instant also move it... that is just connected to weight and area displacement (forgive the bad scientific translations). All these things are part of the world God created for us to live in, a world full of limits, and therefor we cannot understand the concepts of no limits... just as we can't understand eternity... And Jesus being at creation, but also only being born 2000 years ago...