Verified answer

1 KN/mm^2 * 1000 N/KN * (1 m/1000 mm)^2 = 1 N/m/m

So, you need to divide by 1000.

to go from kN to N you need to multiply by 1000.

to go from 1/mm^2 to 1/m^2 you would have to multiply by 1000000

therefore, in total, you have to multiply by 1,000,000,000 (a billion)

hope this helps!