Q: Is 642,390 a Composite Number?

Why is 642,390 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 642,390 can be evenly divided by 1 2 3 5 6 7 10 14 15 19 21 23 30 35 38 42 46 49 57 69 70 95 98 105 114 115 133 138 147 161 190 210 230 245 266 285 294 322 345 399 437 483 490 570 665 690 735 798 805 874 931 966 1,127 1,311 1,330 1,470 1,610 1,862 1,995 2,185 2,254 2,415 2,622 2,793 3,059 3,381 3,990 4,370 4,655 4,830 5,586 5,635 6,118 6,555 6,762 9,177 9,310 11,270 13,110 13,965 15,295 16,905 18,354 21,413 27,930 30,590 33,810 42,826 45,885 64,239 91,770 107,065 128,478 214,130 321,195 and 642,390, with no remainder.

Since 642,390 cannot be divided by just 1 and 642,390, 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).