Q: Is 1,666,420 a Prime Number?
A: No, 1,666,420 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 1666420 can be evenly divided by 1 2 4 5 7 10 14 20 28 35 70 140 11,903 23,806 47,612 59,515 83,321 119,030 166,642 238,060 333,284 416,605 833,210 and 1,666,420, with no remainder.
Since 1,666,420 cannot be divided by just 1 and 1,666,420, it is not a prime number.