Q: Is 421,520 a Prime Number?
A: No, 421,520 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 421520 can be evenly divided by 1 2 4 5 8 10 11 16 20 22 40 44 55 80 88 110 176 220 440 479 880 958 1,916 2,395 3,832 4,790 5,269 7,664 9,580 10,538 19,160 21,076 26,345 38,320 42,152 52,690 84,304 105,380 210,760 and 421,520, with no remainder.
Since 421,520 cannot be divided by just 1 and 421,520, it is not a prime number.