Q: Is 640,620 a Prime Number?
A: No, 640,620 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 640620 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 30 36 45 60 90 180 3,559 7,118 10,677 14,236 17,795 21,354 32,031 35,590 42,708 53,385 64,062 71,180 106,770 128,124 160,155 213,540 320,310 and 640,620, with no remainder.
Since 640,620 cannot be divided by just 1 and 640,620, it is not a prime number.