Q: Is 121,878 a Prime Number?
A: No, 121,878 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 121878 can be evenly divided by 1 2 3 6 9 18 27 37 54 61 74 111 122 183 222 333 366 549 666 999 1,098 1,647 1,998 2,257 3,294 4,514 6,771 13,542 20,313 40,626 60,939 and 121,878, with no remainder.
Since 121,878 cannot be divided by just 1 and 121,878, it is not a prime number.