It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 321 667 is not a prime number.
For example, 321 667 can be divided by 67: 321 667 / 67 = 4 801.
For 321 667 to be a prime number, it would have been required that 321 667 has only two divisors, i.e., itself and 1.
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321 667 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 321 667 is about 567.157.
Thus, the square root of 321 667 is not an integer, and therefore 321 667 is not a square number.
The square of a number (here 321 667) is the result of the product of this number (321 667) by itself (i.e., 321 667 × 321 667); the square of 321 667 is sometimes called "raising 321 667 to the power 2", or "321 667 squared".
The square of 321 667 is 103 469 658 889 because 321 667 × 321 667 = 321 6672 = 103 469 658 889.
As a consequence, 321 667 is the square root of 103 469 658 889.
The multiples of 321 667 are all integers evenly divisible by 321 667, that is all numbers such that the remainder of the division by 321 667 is zero. There are infinitely many multiples of 321 667. The smallest multiples of 321 667 are: