Q: Is 31,878 a Prime Number?
A: No, 31,878 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 31878 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 23 33 42 46 63 66 69 77 99 126 138 154 161 198 207 231 253 322 414 462 483 506 693 759 966 1,386 1,449 1,518 1,771 2,277 2,898 3,542 4,554 5,313 10,626 15,939 and 31,878, with no remainder.
Since 31,878 cannot be divided by just 1 and 31,878, it is not a prime number.