Q: Is 1,215,375 a Prime Number?
A: No, 1,215,375 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 1215375 can be evenly divided by 1 3 5 7 15 21 25 35 75 105 125 175 375 463 525 875 1,389 2,315 2,625 3,241 6,945 9,723 11,575 16,205 34,725 48,615 57,875 81,025 173,625 243,075 405,125 and 1,215,375, with no remainder.
Since 1,215,375 cannot be divided by just 1 and 1,215,375, it is not a prime number.