Q: Is 28,420 a Prime Number?
A: No, 28,420 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 28420 can be evenly divided by 1 2 4 5 7 10 14 20 28 29 35 49 58 70 98 116 140 145 196 203 245 290 406 490 580 812 980 1,015 1,421 2,030 2,842 4,060 5,684 7,105 14,210 and 28,420, with no remainder.
Since 28,420 cannot be divided by just 1 and 28,420, it is not a prime number.