The prefixes sept(a)- and hept(a)- may both be used for seven. The month of September was originally the seventh in the Roman calendar.
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sept- sept-
Hepta is a prefix. It means 7. A heptagon is a 7 sided polygon.(7 sided shape) 6 7
The kilo- prefix means thousand → 1 km = 1000 m → 7 km = 7 x 1000 m = 7000 m
km means "kilometers"; the prefix "k" or "kilo" means 1000.
"Im" is a common prefix in itself, you don't add a prefix to a prefix.