Q: Is 345,720 a Prime Number?
A: No, 345,720 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 345720 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 20 24 30 40 43 60 67 86 120 129 134 172 201 215 258 268 335 344 402 430 516 536 645 670 804 860 1,005 1,032 1,290 1,340 1,608 1,720 2,010 2,580 2,680 2,881 4,020 5,160 5,762 8,040 8,643 11,524 14,405 17,286 23,048 28,810 34,572 43,215 57,620 69,144 86,430 115,240 172,860 and 345,720, with no remainder.
Since 345,720 cannot be divided by just 1 and 345,720, it is not a prime number.