It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 665 671 is not a prime number.
For example, 665 671 can be divided by 139: 665 671 / 139 = 4 789.
For 665 671 to be a prime number, it would have been required that 665 671 has only two divisors, i.e., itself and 1.
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665 671 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 665 671 is about 815.887.
Thus, the square root of 665 671 is not an integer, and therefore 665 671 is not a square number.
The square of a number (here 665 671) is the result of the product of this number (665 671) by itself (i.e., 665 671 × 665 671); the square of 665 671 is sometimes called "raising 665 671 to the power 2", or "665 671 squared".
The square of 665 671 is 443 117 880 241 because 665 671 × 665 671 = 665 6712 = 443 117 880 241.
As a consequence, 665 671 is the square root of 443 117 880 241.
The multiples of 665 671 are all integers evenly divisible by 665 671, that is all numbers such that the remainder of the division by 665 671 is zero. There are infinitely many multiples of 665 671. The smallest multiples of 665 671 are: