This number is a prime.
8443 is the largest 4-digit prime that becomes a square if you move the rightmost digit to the far left: 8443 --> 3844 = 62^2. [Keith]
8443 is the largest 4-digit prime that becomes a square if
you move the rightmost digit to the far left: 8443 -->
3844 = 62^2. [Keith]