Q: Is 2,560,640 a Prime Number?
A: No, 2,560,640 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 2560640 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 640 4,001 8,002 16,004 20,005 32,008 40,010 64,016 80,020 128,032 160,040 256,064 320,080 512,128 640,160 1,280,320 and 2,560,640, with no remainder.
Since 2,560,640 cannot be divided by just 1 and 2,560,640, it is not a prime number.