Q: Is 391,920 a Prime Number?
A: No, 391,920 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 391920 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 23 24 30 40 46 48 60 69 71 80 92 115 120 138 142 184 213 230 240 276 284 345 355 368 426 460 552 568 690 710 852 920 1,065 1,104 1,136 1,380 1,420 1,633 1,704 1,840 2,130 2,760 2,840 3,266 3,408 4,260 4,899 5,520 5,680 6,532 8,165 8,520 9,798 13,064 16,330 17,040 19,596 24,495 26,128 32,660 39,192 48,990 65,320 78,384 97,980 130,640 195,960 and 391,920, with no remainder.
Since 391,920 cannot be divided by just 1 and 391,920, it is not a prime number.