A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1493400 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 19 20 24 25 30 38 40 50 57 60 75 76 95 100 114 120 131 150 152 190 200 228 262 285 300 380 393 456 475 524 570 600 655 760 786 950 1,048 1,140 1,310 1,425 1,572 1,900 1,965 2,280 2,489 2,620 2,850 3,144 3,275 3,800 3,930 4,978 5,240 5,700 6,550 7,467 7,860 9,825 9,956 11,400 12,445 13,100 14,934 15,720 19,650 19,912 24,890 26,200 29,868 37,335 39,300 49,780 59,736 62,225 74,670 78,600 99,560 124,450 149,340 186,675 248,900 298,680 373,350 497,800 746,700 and 1,493,400, with no remainder.
Since 1,493,400 cannot be divided by just 1 and 1,493,400, it is not a prime number.