Q: Is 1,378,125 a Prime Number?
A: No, 1,378,125 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 1378125 can be evenly divided by 1 3 5 7 9 15 21 25 35 45 49 63 75 105 125 147 175 225 245 315 375 441 525 625 735 875 1,125 1,225 1,575 1,875 2,205 2,625 3,125 3,675 4,375 5,625 6,125 7,875 9,375 11,025 13,125 18,375 21,875 28,125 30,625 39,375 55,125 65,625 91,875 153,125 196,875 275,625 459,375 and 1,378,125, with no remainder.
Since 1,378,125 cannot be divided by just 1 and 1,378,125, it is not a prime number.