In order to convert meters to kilometers you would go meters divided by 1000 = kilometers. So your answer is 0.0057104.
You can convert kilometers to meters, or square kilometers to square meters. But you can't convert kilometers (a linear unit) to square meters (a square unit).
5.4 x 104 meters is 54,000 meters or 54 kilometers. (A kilometer is 1000 meters.) Notationally, 1 km= 1 x 103 meters. To convert the exponent form, divide by 103 (reduce exponent by 3) : 5.4 x 104 / 1 x 103 = 5.4 x 104-3 = 5.4 x 101 = 54.
Convert 5.7 x 10µ meters to kilometers.
778,600,000 kilometers = 778,600,000,000 meters
975,000 meters = 975 kilometers
4.5 meters = 0.0045 kilometers
27.5 kilometers = 27,500 meters
10 kilometers = 10,000 meters
553.33 meters = 0.5533 kilometers
3.4 kilometers = 3,400 meters
0.75 kilometers = 750 meters. (A kilometer is 1000 meters.)