Q: Is 397,664 a Prime Number?
A: No, 397,664 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 397664 can be evenly divided by 1 2 4 8 16 17 32 34 43 68 86 136 172 272 289 344 544 578 688 731 1,156 1,376 1,462 2,312 2,924 4,624 5,848 9,248 11,696 12,427 23,392 24,854 49,708 99,416 198,832 and 397,664, with no remainder.
Since 397,664 cannot be divided by just 1 and 397,664, it is not a prime number.