Yes.
Yes.
Yes.
No, 60 is not a multiple of 150. Multiples can't be smaller than the numbers they are compared to.
1.49 is smaller than 150.
150 is smaller than 450.
150 is not a square number See related link for a list of square numbers
I suspect you are really asking for between which two whole numbers does the square root of 150 lie. The square root of 150 lies between 12 and 13 (mathematically: 12 < √150 < 13).
There are 35 prime numbers less than 150.
151
150 = 12 + 62 + 72 + 82
100+25+25 = 150