what is the square root of 1 times 10 to the 19 power
Do you mean √1 x (10^19) which is 1 x ( 10^19 ) which is just 10^19 (a 1 followed by 19 zeroes)
or √( 1 x 10 ) ^ 19 = √10 ^ 19 which is 3 162 277 660 (approx)