A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7144260 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 23 30 31 46 60 62 69 92 93 115 124 138 155 167 186 230 276 310 334 345 372 460 465 501 620 668 690 713 835 930 1,002 1,380 1,426 1,670 1,860 2,004 2,139 2,505 2,852 3,340 3,565 3,841 4,278 5,010 5,177 7,130 7,682 8,556 10,020 10,354 10,695 11,523 14,260 15,364 15,531 19,205 20,708 21,390 23,046 25,885 31,062 38,410 42,780 46,092 51,770 57,615 62,124 76,820 77,655 103,540 115,230 119,071 155,310 230,460 238,142 310,620 357,213 476,284 595,355 714,426 1,190,710 1,428,852 1,786,065 2,381,420 3,572,130 and 7,144,260, with no remainder.
Since 7,144,260 cannot be divided by just 1 and 7,144,260, it is not a prime number.