The source's numerical pattern takes “This is a number” as a condition and presents “It is even or odd” as the consequent.
Antecedent: “This is a number” — categorical.
Consequent: “It is even or odd” — disjunctive.
The “or” within the consequent makes that component disjunctive. But the whole statement remains a connected conditional because of its outer “if … then …” relation.
Analysis requires identifying complete clauses, not merely picking out the individual terms “number,” “even,” and “odd.”