Q: Is 561,280 a Prime Number?
A: No, 561,280 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 561280 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 640 877 1,754 3,508 4,385 7,016 8,770 14,032 17,540 28,064 35,080 56,128 70,160 112,256 140,320 280,640 and 561,280, with no remainder.
Since 561,280 cannot be divided by just 1 and 561,280, it is not a prime number.