You asked:

are siamangs old world monkeys

No
Old World monkey
Old World monkey

Old World monkeys or Cercopithecidae, a group of primates, falling in the superfamily Cercopithecoidea in the clade Catarrhini

Siamang
Siamang

Siamang, an arboreal, black furred gibbon native to the forests of Malaysia, Thailand, and Sumatra

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