they are male flowers.
Many papaya "varieties" or, "types" (since they are by seed)
produce male and female plants.
some also produce Hermaphrodite plants.
some Herm plants will also produce male flowers
(normally, they produce "perfect" flowers)
Most male plants have long stalks with clusters of flowers
male trees do not normally produce fruit
(but do sometimes... sometimes the first flower of each cluster)
herm, or female flowers are larger at the base.
papaya sex is strange.
i read somewhere there are several possibilities
(i think 7 or more)
most of these variations are dependent on what variety/type you have