Q: Is 25,640 a Prime Number?
A: No, 25,640 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 25640 can be evenly divided by 1 2 4 5 8 10 20 40 641 1,282 2,564 3,205 5,128 6,410 12,820 and 25,640, with no remainder.
Since 25,640 cannot be divided by just 1 and 25,640, it is not a prime number.