Q: Is 555,640 a Prime Number?
A: No, 555,640 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 555640 can be evenly divided by 1 2 4 5 8 10 20 29 40 58 116 145 232 290 479 580 958 1,160 1,916 2,395 3,832 4,790 9,580 13,891 19,160 27,782 55,564 69,455 111,128 138,910 277,820 and 555,640, with no remainder.
Since 555,640 cannot be divided by just 1 and 555,640, it is not a prime number.