Q: Is 1,638 a Prime Number?
A: No, 1,638 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 1638 can be evenly divided by 1 2 3 6 7 9 13 14 18 21 26 39 42 63 78 91 117 126 182 234 273 546 819 and 1,638, with no remainder.
Since 1,638 cannot be divided by just 1 and 1,638, it is not a prime number.