It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 670 321 is not a prime number.
For example, 1 670 321 can be divided by 1 091: 1 670 321 / 1091 = 1 531.
For 1 670 321 to be a prime number, it would have been required that 1 670 321 has only two divisors, i.e., itself and 1.
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1 670 321 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 1 670 321 is about 1 292.409.
Thus, the square root of 1 670 321 is not an integer, and therefore 1 670 321 is not a square number.
The square of a number (here 1 670 321) is the result of the product of this number (1 670 321) by itself (i.e., 1 670 321 × 1 670 321); the square of 1 670 321 is sometimes called "raising 1 670 321 to the power 2", or "1 670 321 squared".
The square of 1 670 321 is 2 789 972 243 041 because 1 670 321 × 1 670 321 = 1 670 3212 = 2 789 972 243 041.
As a consequence, 1 670 321 is the square root of 2 789 972 243 041.
The multiples of 1 670 321 are all integers evenly divisible by 1 670 321, that is all numbers such that the remainder of the division by 1 670 321 is zero. There are infinitely many multiples of 1 670 321. The smallest multiples of 1 670 321 are: