Q: Is 18,720 a Prime Number?
A: No, 18,720 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 18720 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 30 32 36 39 40 45 48 52 60 65 72 78 80 90 96 104 117 120 130 144 156 160 180 195 208 234 240 260 288 312 360 390 416 468 480 520 585 624 720 780 936 1,040 1,170 1,248 1,440 1,560 1,872 2,080 2,340 3,120 3,744 4,680 6,240 9,360 and 18,720, with no remainder.
Since 18,720 cannot be divided by just 1 and 18,720, it is not a prime number.