Almost 12345654321

Number Theory Level 3

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

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