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Check if a number is a power-of-n.
Similar: isPow, prevPow, nextPow.
function isPow(x, n) // x: a number // n: base
const xnumber = require('extra-number'); xnumber.isPow(32, 2); // → true xnumber.isPow(32, 4); // → false xnumber.isPow(64, 4); // → true