Q: Is 640,020 a Prime Number?
A: No, 640,020 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 640020 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 30 60 10,667 21,334 32,001 42,668 53,335 64,002 106,670 128,004 160,005 213,340 320,010 and 640,020, with no remainder.
Since 640,020 cannot be divided by just 1 and 640,020, it is not a prime number.