A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7244928 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 19 24 32 36 38 48 57 64 72 76 96 114 128 144 152 171 192 228 288 304 331 342 384 456 576 608 662 684 912 993 1,152 1,216 1,324 1,368 1,824 1,986 2,432 2,648 2,736 2,979 3,648 3,972 5,296 5,472 5,958 6,289 7,296 7,944 10,592 10,944 11,916 12,578 15,888 18,867 21,184 21,888 23,832 25,156 31,776 37,734 42,368 47,664 50,312 56,601 63,552 75,468 95,328 100,624 113,202 127,104 150,936 190,656 201,248 226,404 301,872 381,312 402,496 452,808 603,744 804,992 905,616 1,207,488 1,811,232 2,414,976 3,622,464 and 7,244,928, with no remainder.
Since 7,244,928 cannot be divided by just 1 and 7,244,928, it is not a prime number.