Can You Solve It

Figure out how many trailing zeroes are in 1000! 

I have 4 corners. I have 4 sides.

I have 2 long sides and 2 short sides.

Who I am?

If 

111 = 13

112 = 24

113 = 35

114 = 46

115 = 57

Then

116 = .....???

Which 3-letter word can be inserted into all four lines above to form complete words?

P_ _ _ N T

D E _ _ _ S T

S T _ _ _

C _ _ _ E R

My body is long. I am very healthy.

You can make juice from me. I wear an orange coat. 

I grow underground.

Who I am?