Q: Is 640,724 a Prime Number?
A: No, 640,724 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 640724 can be evenly divided by 1 2 4 7 14 28 49 98 196 343 467 686 934 1,372 1,868 3,269 6,538 13,076 22,883 45,766 91,532 160,181 320,362 and 640,724, with no remainder.
Since 640,724 cannot be divided by just 1 and 640,724, it is not a prime number.