Q: Is 421,542 a Prime Number?
A: No, 421,542 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 421542 can be evenly divided by 1 2 3 6 9 11 18 22 33 66 99 198 2,129 4,258 6,387 12,774 19,161 23,419 38,322 46,838 70,257 140,514 210,771 and 421,542, with no remainder.
Since 421,542 cannot be divided by just 1 and 421,542, it is not a prime number.