Answer : The incorrect option is, 53.6 hectometers (hm)
Explanation :
(1) The conversion used from kilometers to hectometers is:
1 km = 10 hm
Converting the given value, we get:

The value in hectometers is 5.36 hm
(2) The conversion used from kilometers to meters is:
1 km = 1000 m
Converting the given value, we get:

The value in meters is 536 m
(3) The conversion used from kilometers to millimeters is:
1 km = 1000000 mm
Converting the given value, we get:

The value in millimeters is 536000 mm
(4) The conversion used from kilometers to centimeters is:
1 km = 100000 cm
Converting the given value, we get:

The value in centimeters is 53600 cm
Hence, the incorrect answer is, 53.6 hectometers (hm)