Q: Is 1,553,445 a Prime Number?
A: No, 1,553,445 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 1553445 can be evenly divided by 1 3 5 9 15 27 37 45 111 135 185 311 333 555 933 999 1,555 1,665 2,799 4,665 4,995 8,397 11,507 13,995 34,521 41,985 57,535 103,563 172,605 310,689 517,815 and 1,553,445, with no remainder.
Since 1,553,445 cannot be divided by just 1 and 1,553,445, it is not a prime number.