It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 167 421 is not a prime number.
For example, 167 421 can be divided by 3: 167 421 / 3 = 55 807.
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For 167 421 to be a prime number, it would have been required that 167 421 has only two divisors, i.e., itself and 1.
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167 421 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 167 421 is about 409.171.
Thus, the square root of 167 421 is not an integer, and therefore 167 421 is not a square number.
The square of a number (here 167 421) is the result of the product of this number (167 421) by itself (i.e., 167 421 × 167 421); the square of 167 421 is sometimes called "raising 167 421 to the power 2", or "167 421 squared".
The square of 167 421 is 28 029 791 241 because 167 421 × 167 421 = 167 4212 = 28 029 791 241.
As a consequence, 167 421 is the square root of 28 029 791 241.
The multiples of 167 421 are all integers evenly divisible by 167 421, that is all numbers such that the remainder of the division by 167 421 is zero. There are infinitely many multiples of 167 421. The smallest multiples of 167 421 are: