Q: Is 1,604,421 a Prime Number?
A: No, 1,604,421 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 1604421 can be evenly divided by 1 3 7 9 13 21 27 39 63 91 117 189 273 351 653 819 1,959 2,457 4,571 5,877 8,489 13,713 17,631 25,467 41,139 59,423 76,401 123,417 178,269 229,203 534,807 and 1,604,421, with no remainder.
Since 1,604,421 cannot be divided by just 1 and 1,604,421, it is not a prime number.