Q: Is 420,400 a Prime Number?
A: No, 420,400 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 420400 can be evenly divided by 1 2 4 5 8 10 16 20 25 40 50 80 100 200 400 1,051 2,102 4,204 5,255 8,408 10,510 16,816 21,020 26,275 42,040 52,550 84,080 105,100 210,200 and 420,400, with no remainder.
Since 420,400 cannot be divided by just 1 and 420,400, it is not a prime number.