A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 375360 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 23 24 30 32 34 40 46 48 51 60 64 68 69 80 85 92 96 102 115 120 136 138 160 170 184 192 204 230 240 255 272 276 320 340 345 368 391 408 460 480 510 544 552 680 690 736 782 816 920 960 1,020 1,088 1,104 1,173 1,360 1,380 1,472 1,564 1,632 1,840 1,955 2,040 2,208 2,346 2,720 2,760 3,128 3,264 3,680 3,910 4,080 4,416 4,692 5,440 5,520 5,865 6,256 7,360 7,820 8,160 9,384 11,040 11,730 12,512 15,640 16,320 18,768 22,080 23,460 25,024 31,280 37,536 46,920 62,560 75,072 93,840 125,120 187,680 and 375,360, with no remainder.
Since 375,360 cannot be divided by just 1 and 375,360, it is not a prime number.