Q: Is 1,321,005 a Prime Number?
A: No, 1,321,005 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 1321005 can be evenly divided by 1 3 5 7 15 21 23 35 69 105 115 161 345 483 547 805 1,641 2,415 2,735 3,829 8,205 11,487 12,581 19,145 37,743 57,435 62,905 88,067 188,715 264,201 440,335 and 1,321,005, with no remainder.
Since 1,321,005 cannot be divided by just 1 and 1,321,005, it is not a prime number.