Q: Is 321,920 a Prime Number?
A: No, 321,920 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 321920 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 503 640 1,006 2,012 2,515 4,024 5,030 8,048 10,060 16,096 20,120 32,192 40,240 64,384 80,480 160,960 and 321,920, with no remainder.
Since 321,920 cannot be divided by just 1 and 321,920, it is not a prime number.