Q: Is 31,640 a Prime Number?
A: No, 31,640 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 31640 can be evenly divided by 1 2 4 5 7 8 10 14 20 28 35 40 56 70 113 140 226 280 452 565 791 904 1,130 1,582 2,260 3,164 3,955 4,520 6,328 7,910 15,820 and 31,640, with no remainder.
Since 31,640 cannot be divided by just 1 and 31,640, it is not a prime number.