Yes, in so far as all numbers are squares (of some number). But it is not a perfect square.
No. The closest triangle numbers to 145 are 136 and 153.
145 is an odd number. All whole numbers ending in five are odd.
145 km is larger than 145 m.145 km = 145 000 m > 145 m
0.145 is the largest number
145 is a composite number because it has more than 2 factors