Q: Is 1,375,521 a Prime Number?
A: No, 1,375,521 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 1375521 can be evenly divided by 1 3 7 17 21 51 119 357 3,853 11,559 26,971 65,501 80,913 196,503 458,507 and 1,375,521, with no remainder.
Since 1,375,521 cannot be divided by just 1 and 1,375,521, it is not a prime number.