Q: Is 261,440 a Prime Number?
A: No, 261,440 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 261440 can be evenly divided by 1 2 4 5 8 10 16 19 20 32 38 40 43 64 76 80 86 95 152 160 172 190 215 304 320 344 380 430 608 688 760 817 860 1,216 1,376 1,520 1,634 1,720 2,752 3,040 3,268 3,440 4,085 6,080 6,536 6,880 8,170 13,072 13,760 16,340 26,144 32,680 52,288 65,360 130,720 and 261,440, with no remainder.
Since 261,440 cannot be divided by just 1 and 261,440, it is not a prime number.