Q: Is 678,216 a Prime Number?
A: No, 678,216 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 678216 can be evenly divided by 1 2 3 4 6 7 8 11 12 14 21 22 24 28 33 42 44 56 66 77 84 88 132 154 168 231 264 308 367 462 616 734 924 1,101 1,468 1,848 2,202 2,569 2,936 4,037 4,404 5,138 7,707 8,074 8,808 10,276 12,111 15,414 16,148 20,552 24,222 28,259 30,828 32,296 48,444 56,518 61,656 84,777 96,888 113,036 169,554 226,072 339,108 and 678,216, with no remainder.
Since 678,216 cannot be divided by just 1 and 678,216, it is not a prime number.