This is not a well posed question since millimeters is a measure of length, which is one dimensional, while the human skin is a 2-dimensional surface and thus needs to be measured in terms of area. So what you meant is "how many millimeters2 is the human skin?"
And besides, this is not a math question, you should tag it in the Biology category (or whatever the related category is).
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The thickness of human skin varies, but on average it is around 1.5 to 2 millimeters thick.
4.4 millimeters = 4.4 millimeters.
75.3 centimeters is 753 millimeters.
How many millimeters are in a meter? There are 1000 millimeters in a meter.
There are 10 millimeters in a centimeter.
600 millimeters ==