No it is not a square number. It's square root is 18.57 rounded.
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Itself because 345/345 = 1
All multiples of 345, which is an infinite number.
345 is a whole number already so just write that.
To find 25 percent of 345, you simply multiply 345 by 0.25 (which is the decimal form of 25 percent). Therefore, 25 percent of 345 is 86.25.
1, 3, 5, 15, 23, 69, 115, 345.