Q: Is 20,400 a Prime Number?
A: No, 20,400 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 20400 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 24 25 30 34 40 48 50 51 60 68 75 80 85 100 102 120 136 150 170 200 204 240 255 272 300 340 400 408 425 510 600 680 816 850 1,020 1,200 1,275 1,360 1,700 2,040 2,550 3,400 4,080 5,100 6,800 10,200 and 20,400, with no remainder.
Since 20,400 cannot be divided by just 1 and 20,400, it is not a prime number.