Q: Is 321,216 a Prime Number?
A: No, 321,216 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 321216 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 24 28 32 42 48 56 64 84 96 112 168 192 224 239 336 448 478 672 717 956 1,344 1,434 1,673 1,912 2,868 3,346 3,824 5,019 5,736 6,692 7,648 10,038 11,472 13,384 15,296 20,076 22,944 26,768 40,152 45,888 53,536 80,304 107,072 160,608 and 321,216, with no remainder.
Since 321,216 cannot be divided by just 1 and 321,216, it is not a prime number.