Q: Is 1,661,607 a Prime Number?
A: No, 1,661,607 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 1661607 can be evenly divided by 1 3 9 19 27 41 57 79 123 171 237 369 513 711 779 1,107 1,501 2,133 2,337 3,239 4,503 7,011 9,717 13,509 21,033 29,151 40,527 61,541 87,453 184,623 553,869 and 1,661,607, with no remainder.
Since 1,661,607 cannot be divided by just 1 and 1,661,607, it is not a prime number.