Q: Is 21,005,040 a Composite Number?

Why is 21,005,040 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 21,005,040 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 35 40 42 48 56 60 70 80 84 105 112 120 140 168 210 240 280 336 420 560 840 1,680 12,503 25,006 37,509 50,012 62,515 75,018 87,521 100,024 125,030 150,036 175,042 187,545 200,048 250,060 262,563 300,072 350,084 375,090 437,605 500,120 525,126 600,144 700,168 750,180 875,210 1,000,240 1,050,252 1,312,815 1,400,336 1,500,360 1,750,420 2,100,504 2,625,630 3,000,720 3,500,840 4,201,008 5,251,260 7,001,680 10,502,520 and 21,005,040, with no remainder.

Since 21,005,040 cannot be divided by just 1 and 21,005,040, 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).