Q: Is 1,678,428 a Prime Number?
A: No, 1,678,428 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 1678428 can be evenly divided by 1 2 3 4 6 9 12 18 27 36 54 108 15,541 31,082 46,623 62,164 93,246 139,869 186,492 279,738 419,607 559,476 839,214 and 1,678,428, with no remainder.
Since 1,678,428 cannot be divided by just 1 and 1,678,428, it is not a prime number.