Q: Is 671,664 a Prime Number?
A: No, 671,664 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 671664 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 24 28 42 48 56 84 112 168 336 1,999 3,998 5,997 7,996 11,994 13,993 15,992 23,988 27,986 31,984 41,979 47,976 55,972 83,958 95,952 111,944 167,916 223,888 335,832 and 671,664, with no remainder.
Since 671,664 cannot be divided by just 1 and 671,664, it is not a prime number.