Q: Is 661,689 a Prime Number?
A: No, 661,689 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 661689 can be evenly divided by 1 3 7 9 21 27 63 81 189 243 389 567 1,167 1,701 2,723 3,501 8,169 10,503 24,507 31,509 73,521 94,527 220,563 and 661,689, with no remainder.
Since 661,689 cannot be divided by just 1 and 661,689, it is not a prime number.