A Study to Find Out if the Study Drug Elecoglipron Helps Adults With Type 2 Diabetes Mellitus by Comparing it With Semaglutide, a Medicine Already Used to Treat Type 2 Diabetes Mellitus

Inclusion Criteria: * Diagnosed with Type 2 Diabetes Mellitus (T2DM) for at least 90 days prior to screening * T2DM inadequately managed with lifestyle management alone or on stable treatment with other background glucose-lowering medication(s) * HbA1c value of ≥ 7% to ≤ 10.5% (53 to 91.3 mmol/mol) * Increased risk of cardiovascular (CV) events defined by ≥1 of: documented coronary heart disease, peripheral arterial disease, ischemic cerebrovascular disease, or heart failure (NYHA II-III); or ≥2 CV risk factors * Body mass index (BMI) of ≥ 23 kg/m2 at screening * Stable body weight (self-reported or documented) for 90 days prior to screening Exclusion Criteria: * Type 1 Diabetes Mellitus (T1DM), secondary forms of diabetes (including congenital forms), or history of ketoacidosis or hyperosmolar coma * Currently receiving or anticipated to receive, therapeutic intervention for diabetic retinopathy and/or macular edema * Have had more than one episode of severe hypoglycemia within 180 days prior to screening or has a history of hypoglycemia unawareness or poor recognition of hypoglycemic symptoms * Clinically significant condition affecting the upper Gastrointestinal (GI) tract or chronic use of any medication that affects gastric motility or gastric emptying * History of acute or chronic pancreatitis * Severe congestive heart failure (NYHA IV) * History/family history of medullary thyroid cancer or multiple endocrine neoplasia type 2