Q: Is 1,561,280 a Composite Number?

Why is 1,561,280 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 1,561,280 can be evenly divided by 1 2 4 5 7 8 10 14 16 17 20 28 32 34 35 40 41 56 64 68 70 80 82 85 112 119 136 140 160 164 170 205 224 238 272 280 287 320 328 340 410 448 476 544 560 574 595 656 680 697 820 952 1,088 1,120 1,148 1,190 1,312 1,360 1,394 1,435 1,640 1,904 2,240 2,296 2,380 2,624 2,720 2,788 2,870 3,280 3,485 3,808 4,592 4,760 4,879 5,440 5,576 5,740 6,560 6,970 7,616 9,184 9,520 9,758 11,152 11,480 13,120 13,940 18,368 19,040 19,516 22,304 22,960 24,395 27,880 38,080 39,032 44,608 45,920 48,790 55,760 78,064 91,840 97,580 111,520 156,128 195,160 223,040 312,256 390,320 780,640 and 1,561,280, with no remainder.

Since 1,561,280 cannot be divided by just 1 and 1,561,280, 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).