Q: Is 1,821,020 a Prime Number?
A: No, 1,821,020 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1821020 can be evenly divided by 1 2 4 5 10 20 83 166 332 415 830 1,097 1,660 2,194 4,388 5,485 10,970 21,940 91,051 182,102 364,204 455,255 910,510 and 1,821,020, with no remainder.
Since 1,821,020 cannot be divided by just 1 and 1,821,020, it is not a prime number.