Q: Is 620,655 a Prime Number?
A: No, 620,655 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 620655 can be evenly divided by 1 3 5 7 15 21 23 35 69 105 115 161 257 345 483 771 805 1,285 1,799 2,415 3,855 5,397 5,911 8,995 17,733 26,985 29,555 41,377 88,665 124,131 206,885 and 620,655, with no remainder.
Since 620,655 cannot be divided by just 1 and 620,655, it is not a prime number.