The square root of 324 is 18. Do you mean the square root? Or do you mean the root of 324, squared? If you do, and by "root" you mean "square root", then 324.

the brought people form all over the world to liove in panama the wst Indians first tried to built it but they failed so them the Americans tried and they succeded so that is how the panama cannal came to being

If you mean, the square root of 4 multiplied by the square root of 5, that is 2x5=10 If you mean, the square root of ( 4x25), that is the square root of 100 which is 10