Q: Is 1,378,728 a Prime Number?
A: No, 1,378,728 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 1378728 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 24 26 27 36 39 52 54 72 78 104 108 117 156 216 234 312 351 468 491 702 936 982 1,404 1,473 1,964 2,808 2,946 3,928 4,419 5,892 6,383 8,838 11,784 12,766 13,257 17,676 19,149 25,532 26,514 35,352 38,298 51,064 53,028 57,447 76,596 106,056 114,894 153,192 172,341 229,788 344,682 459,576 689,364 and 1,378,728, with no remainder.
Since 1,378,728 cannot be divided by just 1 and 1,378,728, it is not a prime number.