It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 387 018 is not a prime number.
For example, 387 018 can be divided by 2: 387 018 / 2 = 193 509.
For 387 018 to be a prime number, it would have been required that 387 018 has only two divisors, i.e., itself and 1.
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387 018 is an even number, because it is evenly divisible by 2: 387 018 / 2 = 193 509.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 387 018 is about 622.108.
Thus, the square root of 387 018 is not an integer, and therefore 387 018 is not a square number.
The square of a number (here 387 018) is the result of the product of this number (387 018) by itself (i.e., 387 018 × 387 018); the square of 387 018 is sometimes called "raising 387 018 to the power 2", or "387 018 squared".
The square of 387 018 is 149 782 932 324 because 387 018 × 387 018 = 387 0182 = 149 782 932 324.
As a consequence, 387 018 is the square root of 149 782 932 324.
The multiples of 387 018 are all integers evenly divisible by 387 018, that is all numbers such that the remainder of the division by 387 018 is zero. There are infinitely many multiples of 387 018. The smallest multiples of 387 018 are: