Q: Is 1,556,604 a Prime Number?
A: No, 1,556,604 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 1556604 can be evenly divided by 1 2 3 4 6 7 9 12 14 18 21 27 28 29 36 42 54 58 63 71 84 87 108 116 126 142 174 189 203 213 252 261 284 348 378 406 426 497 522 609 639 756 783 812 852 994 1,044 1,218 1,278 1,491 1,566 1,827 1,917 1,988 2,059 2,436 2,556 2,982 3,132 3,654 3,834 4,118 4,473 5,481 5,964 6,177 7,308 7,668 8,236 8,946 10,962 12,354 13,419 14,413 17,892 18,531 21,924 24,708 26,838 28,826 37,062 43,239 53,676 55,593 57,652 74,124 86,478 111,186 129,717 172,956 222,372 259,434 389,151 518,868 778,302 and 1,556,604, with no remainder.
Since 1,556,604 cannot be divided by just 1 and 1,556,604, it is not a prime number.