Those are not really compatible units; newtons is a unit of force, kilogram is a unit of mass.
Assuming normal Earth gravity, you can divide the weight in newtons by 9.8 to obtain the corresponding mass in kilograms.
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100,000 kg = 980,700 newtons
25.9 kg = about 254 newtons.
7840 newtons
5.9 kg weighs 57.82 newtons (on earth, rounded), regardless of what those kg are composed of.
On Earth, 1,500 kg of mass weighs 14,710 newtons.