Q: Is 1,561,077 a Prime Number?
A: No, 1,561,077 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 1561077 can be evenly divided by 1 3 7 9 21 63 71 213 349 497 639 1,047 1,491 2,443 3,141 4,473 7,329 21,987 24,779 74,337 173,453 223,011 520,359 and 1,561,077, with no remainder.
Since 1,561,077 cannot be divided by just 1 and 1,561,077, it is not a prime number.