Q: Is 387,991 a Prime Number?
A: No, 387,991 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 387991 can be evenly divided by 1 17 29 493 787 13,379 22,823 and 387,991, with no remainder.
Since 387,991 cannot be divided by just 1 and 387,991, it is not a prime number.