Q: Is 531,440 a Prime Number?
A: No, 531,440 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 531440 can be evenly divided by 1 2 4 5 7 8 10 13 14 16 20 26 28 35 40 52 56 65 70 73 80 91 104 112 130 140 146 182 208 260 280 292 364 365 455 511 520 560 584 728 730 910 949 1,022 1,040 1,168 1,456 1,460 1,820 1,898 2,044 2,555 2,920 3,640 3,796 4,088 4,745 5,110 5,840 6,643 7,280 7,592 8,176 9,490 10,220 13,286 15,184 18,980 20,440 26,572 33,215 37,960 40,880 53,144 66,430 75,920 106,288 132,860 265,720 and 531,440, with no remainder.
Since 531,440 cannot be divided by just 1 and 531,440, it is not a prime number.