Q: Is 261,660 a Prime Number?
A: No, 261,660 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 261660 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 49 60 70 84 89 98 105 140 147 178 196 210 245 267 294 356 420 445 490 534 588 623 735 890 980 1,068 1,246 1,335 1,470 1,780 1,869 2,492 2,670 2,940 3,115 3,738 4,361 5,340 6,230 7,476 8,722 9,345 12,460 13,083 17,444 18,690 21,805 26,166 37,380 43,610 52,332 65,415 87,220 130,830 and 261,660, with no remainder.
Since 261,660 cannot be divided by just 1 and 261,660, it is not a prime number.