Q: Is 1,221,760 a Composite Number?

Why is 1,221,760 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 1,221,760 can be evenly divided by 1 2 4 5 8 10 16 20 23 32 40 46 64 80 83 92 115 128 160 166 184 230 320 332 368 415 460 640 664 736 830 920 1,328 1,472 1,660 1,840 1,909 2,656 2,944 3,320 3,680 3,818 5,312 6,640 7,360 7,636 9,545 10,624 13,280 14,720 15,272 19,090 26,560 30,544 38,180 53,120 61,088 76,360 122,176 152,720 244,352 305,440 610,880 and 1,221,760, with no remainder.

Since 1,221,760 cannot be divided by just 1 and 1,221,760, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).