Q: Is 7,421,820 a Prime Number?
A: No, 7,421,820 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 7421820 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 41 42 60 70 82 84 105 123 140 164 205 210 246 287 410 420 431 492 574 615 820 861 862 1,148 1,230 1,293 1,435 1,722 1,724 2,155 2,460 2,586 2,870 3,017 3,444 4,305 4,310 5,172 5,740 6,034 6,465 8,610 8,620 9,051 12,068 12,930 15,085 17,220 17,671 18,102 25,860 30,170 35,342 36,204 45,255 53,013 60,340 70,684 88,355 90,510 106,026 123,697 176,710 181,020 212,052 247,394 265,065 353,420 371,091 494,788 530,130 618,485 742,182 1,060,260 1,236,970 1,484,364 1,855,455 2,473,940 3,710,910 and 7,421,820, with no remainder.
Since 7,421,820 cannot be divided by just 1 and 7,421,820, it is not a prime number.