Q: Is 621,248 a Prime Number?
A: No, 621,248 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 621248 can be evenly divided by 1 2 4 8 16 17 32 34 64 68 136 272 544 571 1,088 1,142 2,284 4,568 9,136 9,707 18,272 19,414 36,544 38,828 77,656 155,312 310,624 and 621,248, with no remainder.
Since 621,248 cannot be divided by just 1 and 621,248, it is not a prime number.