Almost 12345654321

Is 12345554321 {\color{#E81990}1}{\color{grey}{2}}{\color{#20A900}{3}}{\color{#3D99F6}{4}}{\color{#D61F06}555}{\color{#3D99F6}{4}}{\color{#20A900}{3}}{\color{grey}{2}}{\color{#E81990}1} prime?


Hint: You may use the fact that 111111×111111=12345654321 111111 \times 111111 = {\color{#E81990}1}{\color{grey}{2}}{\color{#20A900}{3}}{\color{#3D99F6}{4}}{\color{#D61F06}5}6{\color{#D61F06}5}{\color{#3D99F6}{4}}{\color{#20A900}{3}}{\color{grey}{2}}{\color{#E81990}1} . This is similar to, but not identical to the above number, due to the middle 6 6 .

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