Q: Is 2,145,423 a Prime Number?
A: No, 2,145,423 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 2145423 can be evenly divided by 1 3 7 19 21 57 133 283 361 399 849 1,083 1,981 2,527 5,377 5,943 7,581 16,131 37,639 102,163 112,917 306,489 715,141 and 2,145,423, with no remainder.
Since 2,145,423 cannot be divided by just 1 and 2,145,423, it is not a prime number.