Wire is thicker/heavier as the gauge numbers go down--and the numbers you are asking about is: first number is gauge, second number is the number of wires. 4/0 is 4 gauge, one conductor; 4/2 is 4 gauge, two conductors (wires). I believe 16 gauge is about normal for household extension cords; 14 and 12 gauge for running circuits; 10 gauge for 220/240. Could be wrong about some of this--not an electrician.
So, yes, 2 ga is heavier than 4ga; 4 heavier than 6, and so on...
Joe
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2016 Tiffin 40 QBH
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2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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