A number is divisible by 88 only if it is divisible by both 8 and 11, since \(88 = 8 \times 11\).

Check 1232: \(1232 \div 88 = 14\), an exact quotient, so it is divisible.

Check 1144: \(1144 \div 88 = 13\), an exact quotient, so it is divisible.

Check 968: \(968 \div 88 = 11\), an exact quotient, so it is divisible.

Check 1058: \(1058 \div 88 = 12.02...\), not a whole number, so 1058 is not divisible by 88.

Hence, the number not divisible by 88 is 1058.