Q: Is 661,988 a Prime Number?
A: No, 661,988 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 661988 can be evenly divided by 1 2 4 167 334 668 991 1,982 3,964 165,497 330,994 and 661,988, with no remainder.
Since 661,988 cannot be divided by just 1 and 661,988, it is not a prime number.