It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 142 402 is not a prime number.
For example, 142 402 can be divided by 2: 142 402 / 2 = 71 201.
For 142 402 to be a prime number, it would have been required that 142 402 has only two divisors, i.e., itself and 1.
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142 402 is an even number, because it is evenly divisible by 2: 142 402 / 2 = 71 201.
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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 142 402 is about 377.362.
Thus, the square root of 142 402 is not an integer, and therefore 142 402 is not a square number.
The square of a number (here 142 402) is the result of the product of this number (142 402) by itself (i.e., 142 402 × 142 402); the square of 142 402 is sometimes called "raising 142 402 to the power 2", or "142 402 squared".
The square of 142 402 is 20 278 329 604 because 142 402 × 142 402 = 142 4022 = 20 278 329 604.
As a consequence, 142 402 is the square root of 20 278 329 604.
The multiples of 142 402 are all integers evenly divisible by 142 402, that is all numbers such that the remainder of the division by 142 402 is zero. There are infinitely many multiples of 142 402. The smallest multiples of 142 402 are: