Q: Is 3,921,428 a Prime Number?
A: No, 3,921,428 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 3921428 can be evenly divided by 1 2 4 7 14 28 43 86 172 301 602 1,204 3,257 6,514 13,028 22,799 45,598 91,196 140,051 280,102 560,204 980,357 1,960,714 and 3,921,428, with no remainder.
Since 3,921,428 cannot be divided by just 1 and 3,921,428, it is not a prime number.