# This calls for wisdom

"Wisdom is needed" or "You need to be wise about this"

# If anyone has insight

"If anyone is able to understand things" 

# let him calculate the number of the beast

"he should discern what the number of the beast means" or "he should figure out what the number of the beast means"

# is the number of a human being

Possible meanings are 1) the number represents one person or 2) the number represents all of humanity.