It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 987 987 is not a prime number.
For example, 987 987 can be divided by 3: 987 987 / 3 = 329 329.
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For 987 987 to be a prime number, it would have been required that 987 987 has only two divisors, i.e., itself and 1.
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987 987 is an odd number, because it is not evenly divisible by 2.
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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 987 987 is about 993.975.
Thus, the square root of 987 987 is not an integer, and therefore 987 987 is not a square number.
The square of a number (here 987 987) is the result of the product of this number (987 987) by itself (i.e., 987 987 × 987 987); the square of 987 987 is sometimes called "raising 987 987 to the power 2", or "987 987 squared".
The square of 987 987 is 976 118 312 169 because 987 987 × 987 987 = 987 9872 = 976 118 312 169.
As a consequence, 987 987 is the square root of 976 118 312 169.
The multiples of 987 987 are all integers evenly divisible by 987 987, that is all numbers such that the remainder of the division by 987 987 is zero. There are infinitely many multiples of 987 987. The smallest multiples of 987 987 are: