It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 387 988 is not a prime number.
For example, 387 988 can be divided by 2: 387 988 / 2 = 193 994.
For 387 988 to be a prime number, it would have been required that 387 988 has only two divisors, i.e., itself and 1.
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387 988 is an even number, because it is evenly divisible by 2: 387 988 / 2 = 193 994.
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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 387 988 is about 622.887.
Thus, the square root of 387 988 is not an integer, and therefore 387 988 is not a square number.
The square of a number (here 387 988) is the result of the product of this number (387 988) by itself (i.e., 387 988 × 387 988); the square of 387 988 is sometimes called "raising 387 988 to the power 2", or "387 988 squared".
The square of 387 988 is 150 534 688 144 because 387 988 × 387 988 = 387 9882 = 150 534 688 144.
As a consequence, 387 988 is the square root of 150 534 688 144.
The multiples of 387 988 are all integers evenly divisible by 387 988, that is all numbers such that the remainder of the division by 387 988 is zero. There are infinitely many multiples of 387 988. The smallest multiples of 387 988 are: