Q: Is 1,321,628 a Prime Number?
A: No, 1,321,628 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 1321628 can be evenly divided by 1 2 4 7 11 14 22 28 44 49 77 98 154 196 308 539 613 1,078 1,226 2,156 2,452 4,291 6,743 8,582 13,486 17,164 26,972 30,037 47,201 60,074 94,402 120,148 188,804 330,407 660,814 and 1,321,628, with no remainder.
Since 1,321,628 cannot be divided by just 1 and 1,321,628, it is not a prime number.