Q: Is 1,288,428 a Prime Number?
A: No, 1,288,428 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 1288428 can be evenly divided by 1 2 3 4 6 12 19 38 57 76 114 228 5,651 11,302 16,953 22,604 33,906 67,812 107,369 214,738 322,107 429,476 644,214 and 1,288,428, with no remainder.
Since 1,288,428 cannot be divided by just 1 and 1,288,428, it is not a prime number.