A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5488392 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 21 24 26 28 39 42 49 52 56 78 84 91 98 104 147 156 168 182 196 273 294 312 359 364 392 546 588 637 718 728 1,077 1,092 1,176 1,274 1,436 1,911 2,154 2,184 2,513 2,548 2,872 3,822 4,308 4,667 5,026 5,096 7,539 7,644 8,616 9,334 10,052 14,001 15,078 15,288 17,591 18,668 20,104 28,002 30,156 32,669 35,182 37,336 52,773 56,004 60,312 65,338 70,364 98,007 105,546 112,008 130,676 140,728 196,014 211,092 228,683 261,352 392,028 422,184 457,366 686,049 784,056 914,732 1,372,098 1,829,464 2,744,196 and 5,488,392, with no remainder.
Since 5,488,392 cannot be divided by just 1 and 5,488,392, it is not a prime number.