Q: Is 1,521,220 a Prime Number?
A: No, 1,521,220 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 1521220 can be evenly divided by 1 2 4 5 10 20 23 46 92 115 230 460 3,307 6,614 13,228 16,535 33,070 66,140 76,061 152,122 304,244 380,305 760,610 and 1,521,220, with no remainder.
Since 1,521,220 cannot be divided by just 1 and 1,521,220, it is not a prime number.