Q: Is 1,555,520 a Prime Number?
A: No, 1,555,520 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 1555520 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 160 320 4,861 9,722 19,444 24,305 38,888 48,610 77,776 97,220 155,552 194,440 311,104 388,880 777,760 and 1,555,520, with no remainder.
Since 1,555,520 cannot be divided by just 1 and 1,555,520, it is not a prime number.