4000. I'm no mathematician but that's an easy mental-arithmetic division based on 4 X 250 =1000, and a million is 1000 X 1000. Generally though, it's easiest to solve this sort of question by dividing by fractions or by using index-laws.
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1million
How many diagonal lines does a 1million sided shape have
1million
100,000 tens.
1 million * 1million = 1,000,000,000,000 or 1 trilion.