Q: Is 15,624 a Prime Number?
A: No, 15,624 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 15624 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 28 31 36 42 56 62 63 72 84 93 124 126 168 186 217 248 252 279 372 434 504 558 651 744 868 1,116 1,302 1,736 1,953 2,232 2,604 3,906 5,208 7,812 and 15,624, with no remainder.
Since 15,624 cannot be divided by just 1 and 15,624, it is not a prime number.