Q: Is 209,664 a Prime Number?
A: No, 209,664 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 209664 can be evenly divided by 1 2 3 4 6 7 8 9 12 13 14 16 18 21 24 26 28 32 36 39 42 48 52 56 63 64 72 78 84 91 96 104 112 117 126 128 144 156 168 182 192 208 224 234 252 256 273 288 312 336 364 384 416 448 468 504 546 576 624 672 728 768 819 832 896 936 1,008 1,092 1,152 1,248 1,344 1,456 1,638 1,664 1,792 1,872 2,016 2,184 2,304 2,496 2,688 2,912 3,276 3,328 3,744 4,032 4,368 4,992 5,376 5,824 6,552 7,488 8,064 8,736 9,984 11,648 13,104 14,976 16,128 17,472 23,296 26,208 29,952 34,944 52,416 69,888 104,832 and 209,664, with no remainder.
Since 209,664 cannot be divided by just 1 and 209,664, it is not a prime number.